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EDEA. EDEA Compass. Diagnostic guide for EDEA testers. Menu. Please select an option. EDEA Compass Diagnostic Flow Charts Basic Theory How to use the Program. How to use the program. Right clicking the Home icon takes you back to last menu viewed. - PowerPoint PPT Presentation
Citation preview
EDEA
EDEA Compass
Diagnostic guide for EDEA testers
1
Menu
EDEA Compass Diagnostic Flow Charts
Basic Theory
How to use the Program
Please select an option
2
Right clicking the Left arrow icon takes you back to last screen viewed.
Right clicking the Right arrow icon takes you to the next screen.
Right clicking the Home icon takes you back to last menu viewed.
Right clicking the Yes icon guides you through the flow chart.
Right clicking the No icon guides you through the flow chart.
Right clicking the Help icon provides information about the test procedure.
Right clicking the Picture icon displays a picture of the subject under discussion.
Right clicking the Video icon plays a video of the subject under discussion.
.
How to use the program
3Right clicking the Toolbox icon demonstrates a testing procedure.
.
Not starting
Poor Idle
Power Loss
Misfire
Cutting out
Diagnostic Flow Chart Menu
Click on the heading which best describes the vehicles symptoms
4
Does the vehicle have spark at the plugs?
No Start
5
Always test for initial spark loss just prior to the spark plug. The reason for testing for spark at this point is that if spark is tested further “upstream” and there is a good spark, the technician may incorrectly assume that the vehicle has spark when it fact it may not have spark further down the ignition system closer to the spark plugs.
So to avoid confusion always make initial checks at this end of the ignition system.
No Start
6
Disconnect from spark plug and test for spark here
Connect this side of the spark tester to ground.
Ignition lead
Testing for spark using the EDEA spark tester
7
Connect this side of the spark tester to ground.
Connect this side of the spark tester to ground.
Connect this side of the spark tester to ground.
Use the spark tester provided in the EDEA tester kit
For an to avoid misdiagnosis test for spark at the last point of the ignition system prior to the spark plugs. If the system has ignition leads test at the lead end that connects to the spark plugs. Testing for spark further up the ignition system may give misleading results leading to lost time.
Distributor ignition system
Coil over plug (COP) ignition system
Coil pack or distributor less ignition system
Disconnect from spark plug and test for spark here
Disconnect from spark plug and test for spark here
Disconnect from spark plug and test for spark here
Vehicle has no spark at the plugs.
What type of ignition system does the vehicle have?
Coil Over Plug
Coil Pack
Distributer
No Start
8
Identify the ignition system
99
Use the spark tester provided in the EDEA tester kit
For an to avoid misdiagnosis test for spark at the last point of the ignition system prior to the spark plugs. If the system has ignition leads test at the lead end that connects to the spark plugs. Testing for spark further up the ignition system may give misleading results leading to lost time.
Distributor ignition system
Coil over plug (COP) ignition system
Coil pack or distributor less ignition system
Vehicle has no spark at the plugs.
The vehicle has a coil over plug ignition system
Is there battery voltage at the coil over plug connector plug when disconnected?
No Start
10
Why disconnect the plug terminal when testing battery voltage.
Why disconnect the connector plug when measuring for voltage at the ignition coil
11
Why disconnect the connector plug when testing battery voltage.
Test for battery voltage at the coil with the plug terminal disconected
The EDEA ignition tester is able to measure voltages from 0 to 15 Volts in one Volt increments with an accuracy of 0.5 volts. The voltmeter has a capture mode that can be configured to detect unwanted drops or rises in voltage. When the tester is in capture mode and an event is detected, the tester will count and record the amount of times the event occurs.
To use the voltmeter function of the EDEA tester connect the red test lead to the top of the EDEA tester. For more information refer to the Instructional CD ROM. Main menu / Extra testing procedures / Voltmeter
Only the LED’s in the SPEED panel are used to display voltage.
Vehicle has no spark at the plugs.
The vehicle has a coil over plug ignition system
There is battery voltage at the coil over plug terminal with the plug disconected
Is the coil receiving a switching signal?
No Start
13
Vehicle has no spark at the plugs.
The vehicle has a coil over plug ignition system
There is battery voltage at the coil over plug terminal with the plug disconnected
The coil is receiving a switching signal
Does the coil have a good ground connection?
No Start
14
Vehicle has no spark at the plugs.
The vehicle has a coil over plug ignition system
There is battery voltage at the coil over plug terminal with the plug disconected
The coil is not receiving a switching signal
Is there battery voltage at the injector connector plug, with plug removed plug from the injector?
No Start
15
Why disconnect the connector plug when testing battery voltage.
Why disconnect the injector connector plug when testing for voltage
16
Why disconnect the connector plug when testing battery voltage.
Test for battery voltage at the injector with the plug connector disconnected
Only the LED’s in the SPEED panel are used to display voltage.
The EDEA ignition tester is able to measure voltages from 0 to 15 Volts in one Volt increments with an accuracy of 0.5 volts. The voltmeter has a capture mode that can be configured to detect unwanted drops or rises in voltage. When the tester is in capture mode and an event is detected, the tester will count and record the amount of times the event occurs.
To use the voltmeter function of the EDEA tester connect the red test lead to the top of the EDEA tester. For more information refer to the Instructional CD ROM. Main menu / Extra testing procedures / Voltmeter
Vehicle has no spark at the plugs.
The vehicle has a coil over plug ignition system
There is battery voltage at the coil over plug terminal with the plug disconnected
The coil is receiving a switching signal
The coil has a good ground connection
Test the coil is it functioning correctly?
No Start
18
Vehicle has no spark at the plugs.
What type of ignition system does the vehicle have?
Vehicle
No Start
19
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have a battery voltage at the coil
Is there battery voltage at the injector, with the injector plug disconnected?
No Start
20
Click the question mark icon below if you are unclear as to why you would disconnect the injector plug before testing for voltage at the injector.
Vehicle has no spark at plugs
Vehicle has no injection pulse.
There is a 12 volt supply to the injector with the injector plug disconnected
Perform a volt drop test.
Does the injector voltage supply wire pass the volt drop test?
Please click the question mark icon below if you are unclear as to what a volt drop test is.
No Start
21
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
Can you hear the fuel pump prime when you turn the key to the on position?
No Start
22
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on
position.
Can you hear any relays click when the ignition key is turned to the on position?
No Start
23
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Is there an injector pulse at the injector?
No Start
24
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
There is no injector pulse at the injector
From this information it appears that the ECU is not operating.
Check all fuses associated with the EFI system or ignition system.
Are any of the fuse blown?
No Start
25
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown.
From this information it appears that the ECU is not operating.
Is there power at any of the ECU pins?
No Start
26
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
Can it be determined where the ECU receives battery voltage?
No Start
27
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can not be determined where the ECU receives battery voltage
Do you have a wiring diagram?
No Start
28
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can not be determined where the ECU receives battery voltage
The technician does not have a wiring diagram
/?????????????????????????????????
Contact EDEA // Cable tracer?
No Start
29
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can not be determined where the ECU receives battery voltage
The technician has a wiring diagram.
Can you determine from the wiring diagram from where the ECU receives battery voltage?
No Start
30
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can be determined where the ECU receives battery voltage
Is there voltage at this source?
No Start
31
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can be determined where the ECU receives battery voltage
There is no voltage at the source the ECU receives battery voltage from
Can it be determined where this source receives battery voltage from?
No Start
32
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can not be determined where the ECU receives battery voltage
The technician has a wiring diagram
The technician cannot determine the ECU battery voltage source using the wiring diagram
???????????????????????????????????????????
No Start
33
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can be determined where the ECU receives battery voltage
There is no voltage at the source the ECU receives battery voltage from
It can not be determined where the battery voltage source to the ECU receives it voltage from.
Do you have a wiring diagram?
No Start
34
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can be determined where the ECU receives battery voltage
There is no voltage at the source the ECU receives battery voltage from
It can not be determined where the battery voltage source to the ECU receives it voltage from.
The technician has a wiring diagram
From the wiring diagram can you determine where the ECU battery source receives its voltage from?
No Start
35
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle has no voltage at the injector
The fuel pump can be heard to prime when the ignition key is turned to the on position
It can not be determined where the injector supply voltage source is
Do you have a wiring diagram?
No Start
36
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
Is there power on the ECU pins that are the main supply to the ECU?
No Start
37
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply pins of the ECU
Can you determine where the main ECU power supply comes from?
No Start
38
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
Is there voltage at the source where the ECU receives its main supply?
No Start
39
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
Can you determine the reason why there is not voltage at this source?
No Start
40
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the souce that supplies the ECU battery voltage
Repair this fault, is the vehicle fixed?
No Start
41
Congratulations
Success !No Start
42
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the source that supplies the ECU battery voltage
The voltage source that supplies battery voltage to the ECU has been repaired but the vehicle is still not fixed
Check for battery voltage at the ECU pins where the ECU receives its main supply from.
Is there voltage at the ECU at is main supply pins?
No Start
43
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the source that supplies the ECU battery voltage
The voltage source that supplies battery voltage to the ECU has been repaired but the vehicle is still not fixed
There is still no battery voltage at the ECU main supply pins
Check for continuity between the ECU voltage supply source and the ECU (Remember to disconnect the battery) Click on the question mark to explain why the battery needs to be disconnected.
Is there continuity?
No Start
44
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the source that supplies the ECU battery voltage
The voltage source that supplies battery voltage to the ECU has been repaired but the vehicle is still not fixed
There is still no battery voltage at the ECU main supply pins
There is no continuity between the ECU battery voltage source and the ECU
Are you testing the correct pins on the ECU?
No Start
45
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the source that supplies the ECU battery voltage
The voltage source that supplies battery voltage to the ECU has been repaired but the vehicle is still not fixed
There is still no battery voltage at the ECU main supply pins
There is continuity between the ECU battery supply and the ECU
Reconnect the vehicle battery. Check
No Start
46
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle has no voltage at the injector
It can be determined where the injector supply source is
Is there voltage at the injector supply source?
No Start
47
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle has no voltage at the injector
It can be determined where the injector supply source is
There is voltage at the injector supply source
Is there continuity from the injector supply source back to the injector?
No Start
48
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle has no voltage at the injector
It can be determined where the injector supply source is
There is voltage at the injector supply source
There is no continuity from the injector supply source back to the injector
Trace the wire from the injector supply source back to the injector look for breaks or bad contacts?
No Start
49
Vehicle has no spark no pulse and no voltage supply to the injector.
Is the injector voltage source from the main relay?
No Start
50
Vehicle has no spark at plugs and no injector pulse.
Vehicle has a 12 volt feed to the injectors.
The injector supply voltage passes a volt drop test
Check crank / cam sensor. Is the crank / cam sensor working?
No Start
51
Vehicle has no spark at plugs and no injector pulse. The vehicle has a 12 volt feed to the injectors. The crank and cam sensor are working.
Is the signal from the crank and cam sensor reaching the ECU?
No Start
52
Replace crank sensor.
After crank sensor has been replace is vehicle starting and running smoothly with no further problems, i.e. poor idle, stalling, stumble.
No Start
53
Congratulations
Success !No Start
54
Does the vehicle have injection pulse?
No Start
55
Vehicle has spark but no injection pulse.
Is there a 12 volt supply at the injector?
Yes (need further notation unlikely recheck pulsing)
No Start
56
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin.
Are the injectors feed from the main relay?
No Start
57
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin injectors are supplied from main relay.
Is there voltage being supplied to the main relay?
No Start
58
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin injectors are supplied from main relay. The main relay has a voltage supply.
Is the main relay switching on when the engine is cranked?
No Start
59
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin injectors are supplied from main relay. The main relay has a voltage supply. The main relay is switching on when engine is cranked.
Is there continuity from main relay output to injectors?
No Start
60
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin injectors are supplied from main relay. The main relay has a voltage supply. The main relay is switching on when engine is cranked.
There is continuity from the main relay output to the injectors.
Are the relay contacts contacting?
No Start
61
Vehicle has spark but no injection pulse, there is no voltage supply at the injector. Voltage is supplied to the injectors from the main relay. The main relay has a voltage supply. The main relay is switching on when engine is cranked. There is continuity from the main relay output to the injectors.
The relay is damaged.
Replace relay if confident otherwise bridge relay contacts to confirm diagnosis.
Bridge relay
No Start
62
Procedure to bridge main relay
voltage kkkkkkkkkkkkkkkkkkkkkkkk.
No Start
63
Vehicle has spark at plugs and injection pulse.
Does the vehicle have fuel pressure?
No Start
64
Vehicle has spark at plugs, injection pulse but no fuel pressure.
Is there voltage at the pump when the vehicle is cranked?
No Start
65
Vehicle has spark at plugs, injection pulse but no fuel pressure and no voltage at fuel pump terminals.
Is there voltage at fuel pump relay.
No Start
66
Vehicle has spark at plugs, injection pulse, no fuel pressure, there is voltage at fuel pump terminals.
If voltage is supplied directly to the pump is there fuel pressure?
Yes ****volt drop edit
No ***dead pump edit
Help
No Start
67
Vehicle has spark at plugs, injection pulse and fuel pressure.
Does vehicle have fuel flow?
No Start
68
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Does the vehicle have compression?
Vehicle has fuel pressure and flow.
No Start
69
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression.
Disconnect the injectors so that no fuel passes through the injectors.
Continue to next step.
No Start
70
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors.
Crank the engine to remove all traces of fuel.
Mechanical test
Continue to next step.
No Start
71
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors.
Spray a small amount of easy start into the intake manifold while cranking the engine..
Mechanical test
Does the engine try to start?
No Start
72
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors. A small amount of easy start has been sprayed into the intake manifold while cranking the engine.
The engine tries to start.
Mechanical test
The engine may be over fueling or under fueling. Check injector pulse width and duty cycle.Is injector pulse width and duty cycle within parameters?
No Start
73
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors. A small amount of easy start has been sprayed into the intake manifold while cranking the engine.
The engine is not showing any signs of trying to start.
Check to see if the spark plugs are fouled or wet.
Mechanical test
Are the spark plugs fouled or wet?
No Start
74
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors. A small amount of easy start has been sprayed into the intake manifold while cranking the engine.
The engine is not showing any signs of trying to start.
The spark plugs are fouled or wet.
Mechanical test
Dry, clean or replace the plugs. Spray easy start into the inlet manifold while the vehicle is being cranked. Does the vehicle try to start?
No Start
75
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors. A small amount of easy start has been sprayed into the intake manifold while cranking the engine.
The engine is not showing any signs of trying to start. The spark plugs are not wet or fouled.
Mechanical test
Is the ignition timing correct? Next ask about valve timing? Discuss also That if there are no sign of firing that the valve timing may be out even though the Compression is okay?
No Start
76
Vehicle has spark, injection pulse and fuel pressure. It does not have fuel flow.
Is the return line blocked, does it have a return line???????
Vehicle does not have fuel flow
No Start
77
The vehicle has no spark at the plugs
The vehicle has injection pulse
What type of ignition system does the vehicle use?
Distributer
Coil over Plug
Coil Pack
Vehicle has no sparkNo Start
78
Testing individual components
No Start
79
Ignition Coils.
Ignition Modules.
Cam and Crank Position Sensors.
Basic theory
80
Conventional Ignition Coils.
Distributor-less Ignition Coils.
Coil Over Plug Ignition Coils (COP)
Ignition coil theory menu
81
Conventional ignition coils Oil filled ignition coils are basically two coils of wire, a primary coil a and a
secondary coil wrapped around a soft iron core, they are oil filled for cooling.
Transformer type ignition coils primary and secondary windings are constructed around a laminated steel frame. Some types of transformer ignition coils are fully encapsulated by resin. Look for cracking and carbon tracking on the outside of resin encapsulated coils. When testing, if these coils fail to produce a spark, listen for internal shorting within the coil.
In both oil filled and transformer type ignition coils the secondary coil has substantially more windings than the primary coil, making the arrangement a step up transformer. One side of the primary coil is connected to the positive side of the vehicle battery. The other side of the primary coil is connected to the ignition module. The ignition module switches the negative side of the coil to ground.
Conventional ignition coil theory
82
When the ignition module switches the negative side of the coil to ground, current flows into the primary windings. The primary windings behave like an electromagnet. This magnetism in the coil resists the flow of current until no more current can flow into the coil, this condition is called “fully saturated”. When the ignition module switches off the primary circuit, the magnetic field in the primary windings rapidly collapses engulfing the secondary coil windings. This collapsing magnetic field induces a high voltage in the secondary coil windings and is dissipated through the soft iron core / laminated steel frame. The soft iron core / laminated frame is part of the coil output tower, that carries the high voltage to the distributor, leads and plugs.
Conventional ignition coil theory
83
Include more images
84
Distributor-less Ignition coils (DIS) are double ended and fire two sparks simultaneously. One spark fires the cylinder on compression stroke and the other to the paired cylinder on exhaust stroke. When the spark from a DIS coil fires a cylinder that is in its exhaust stroke it is referred to as WASTE SPARK .
DIS coils are mainly of the transformer resin filled type construction.
Distributor less ignition coil theory
85
Include more images
Image of distributor less ignition coil
86
The vehicle has no spark at the plugs
The vehicle has injection pulse
The vehicle uses a distributer type ignition system
Is the ignition coil working?
Vehicle has no spark
87
The vehicle has no spark at the plugs
The vehicle has injection pulse
The vehicle uses a COP type ignition system
Is spark loss on every plug
Vehicle has no spark
88
The vehicle has no spark at the plugs
The vehicle has injection pulse
The vehicle uses a coil pack type ignition
Is spark loss on every plug?
Vehicle has no spark
89
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle does not have battery voltage at the injectors
Is there a 12 volt supply to the injector?
No spark no injection pulse
90
Vehicle has spark at plugs
Vehicle has no injection pulse
Vehicle does not have battery voltage at the injectors
Is there a 12 volt supply to the injector with the injector plug disconnected?
No spark no injection pulse
91
Why remove the injector plug when testing for power at the injector
Why disconnect the injector connector plug when testing for voltage
92
Why disconnect the connector plug when testing battery voltage.
Test for battery voltage at the injector with the plug connector disconnected
Only the LED’s in the SPEED panel are used to display voltage.
The EDEA ignition tester is able to measure voltages from 0 to 15 Volts in one Volt increments with an accuracy of 0.5 volts. The voltmeter has a capture mode that can be configured to detect unwanted drops or rises in voltage. When the tester is in capture mode and an event is detected, the tester will count and record the amount of times the event occurs.
To use the voltmeter function of the EDEA tester connect the red test lead to the top of the EDEA tester. For more information refer to the Instructional CD ROM. Main menu / Extra testing procedures / Voltmeter
The vehicle has spark at plugs
The vehicle does not have injection pulse
The vehicle does not have battery voltage at the injectors
Can you hear the fuel pump prime when the ignition key is turned to the on position?
No Start
94
The vehicle has spark at plugs
The vehicle does not have injection pulse
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on
position.
Can you hear any relays click when the ignition key is turned to the on position?
No Start
95
The vehicle has spark at plugs
The vehicle does not have injection pulse
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Is there an injector pulse at the injector?
No Start
96
The vehicle has spark at plugs
The vehicle does not have injection pulse
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
From this information it appears that the ECU is not operating.
Check all fuses associated with the EFI system or ignition system.
Are any of the fuse blown?
No Start
97
The vehicle has spark at plugs
The vehicle does not have injection pulse
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown.
From this information it appears that the ECU is not operating.
Is there power at any of the ECU pins?
No Start
98
The vehicle has spark at plugs
The vehicle does not have injection pulse
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
Can it be determined where the ECU receives battery voltage?
No Start
99
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can not be determined where the ECU receives battery voltage
Do you have a wiring diagram?
No Start
100
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can not be determined where the ECU receives battery voltage
The technician does not have a wiring diagram
/?????????????????????????????????
Contact EDEA // Cable tracer?
No Start
101
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can not be determined where the ECU receives battery voltage
The technician has a wiring diagram.
Can you determine from the wiring diagram from where the ECU receives battery voltage?
No Start
102
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can be determined where the ECU receives battery voltage
Is there voltage at this source?
No Start
103
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can be determined where the ECU receives battery voltage
There is no voltage at the source the ECU receives battery voltage from
Can it be determined where this source receives battery voltage from?
No Start
104
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can not be determined where the ECU receives battery voltage
The technician has a wiring diagram
The technician cannot determine the ECU battery voltage source using the wiring diagram
???????????????????????????????????????????
No Start
105
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can be determined where the ECU receives battery voltage
There is no voltage at the source the ECU receives battery voltage from
It can not be determined where the battery voltage source to the ECU receives it voltage from.
Do you have a wiring diagram?
No Start
106
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
Vehicle has no injection pulse
None of the EFI or ignition fuses are blown
None of the ECU pins have battery voltage
It can be determined where the ECU receives battery voltage
There is no voltage at the source the ECU receives battery voltage from
It can not be determined where the battery voltage source to the ECU receives it voltage from.
The technician has a wiring diagram
From the wiring diagram can you determine where the ECU battery source receives its voltage from?
No Start
107
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle has no voltage at the injector
The fuel pump can be heard to prime when the ignition key is turned to the on position
It can not be determined where the injector supply voltage source is
Do you have a wiring diagram?
No Start
108
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
Is there power on the ECU pins that are the main supply to the ECU?
No Start
109
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply pins of the ECU
Can you determine where the main ECU power supply comes from?
No Start
110
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
Is there voltage at the source where the ECU receives its main supply?
No Start
111
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
Can you determine the reason why there is not voltage at this source?
No Start
112
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the souce that supplies the ECU battery voltage
Repair this fault, is the vehicle fixed?
No Start
113
Congratulations
Success !No Start
114
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the source that supplies the ECU battery voltage
The voltage source that supplies battery voltage to the ECU has been repaired but the vehicle is still not fixed
Check for battery voltage at the ECU pins where the ECU receives its main supply from.
Is there voltage at the ECU at is main supply pins?
No Start
115
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the source that supplies the ECU battery voltage
The voltage source that supplies battery voltage to the ECU has been repaired but the vehicle is still not fixed
There is still no battery voltage at the ECU main supply pins
Check for continuity between the ECU voltage supply source and the ECU (Remember to disconnect the battery) Click on the question mark to explain why the battery needs to be disconnected.
Is there continuity?
No Start
116
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the source that supplies the ECU battery voltage
The voltage source that supplies battery voltage to the ECU has been repaired but the vehicle is still not fixed
There is still no battery voltage at the ECU main supply pins
There is no continuity between the ECU battery voltage source and the ECU
Are you testing the correct pins on the ECU?
No Start
117
Vehicle has no spark at plugs
The vehicle has a coil over plug ignition system
The vehicle does not have battery voltage at the coil
The vehicle does not have battery voltage at the injectors
The fuel pump cannot be heard priming when the ignition key is turned to the on position
No relays can be heard clicking when the ignition key is turned to the on position
None of the EFI or ignition fuses are blown
Vehicle has no injection pulse
There is power on some of the ECU pins
There is no power on the main supply to the ECU
It can be determined where the ECU receives it main supply from
There is no battery voltage at the source where the ECU receives its main supply
It can be determined why there is no voltage at the source that supplies the ECU battery voltage
The voltage source that supplies battery voltage to the ECU has been repaired but the vehicle is still not fixed
There is still no battery voltage at the ECU main supply pins
There is continuity between the ECU battery supply and the ECU
Reconnect the vehicle battery. Check
No Start
118
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle has no voltage at the injector
It can be determined where the injector supply source is
Is there voltage at the injector supply source?
No Start
119
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle has no voltage at the injector
It can be determined where the injector supply source is
There is voltage at the injector supply source
Is there continuity from the injector supply source back to the injector?
No Start
120
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle has no voltage at the injector
It can be determined where the injector supply source is
There is voltage at the injector supply source
There is no continuity from the injector supply source back to the injector
Trace the wire from the injector supply source back to the injector look for breaks or bad contacts?
No Start
121
Vehicle has no spark no pulse and no voltage supply to the injector.
Is the injector voltage source from the main relay?
No Start
122
Vehicle has no spark at plugs and no injector pulse.
Vehicle has a 12 volt feed to the injectors.
The injector supply voltage passes a volt drop test
Check crank / cam sensor. Is the crank / cam sensor working?
No Start
123
Vehicle has no spark at plugs and no injector pulse. The vehicle has a 12 volt feed to the injectors. The crank and cam sensor are working.
Is the signal from the crank and cam sensor reaching the ECU?
No Start
124
Replace crank sensor.
After crank sensor has been replace is vehicle starting and running smoothly with no further problems, i.e. poor idle, stalling, stumble.
No Start
125
Congratulations
Success !No Start
126
Does the vehicle have injection pulse?
No Start
127
Vehicle has spark but no injection pulse.
Is there a 12 volt supply at the injector?
Yes (need further notation unlikely recheck pulsing)
No Start
128
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin.
Are the injectors feed from the main relay?
No Start
129
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin injectors are supplied from main relay.
Is there voltage being supplied to the main relay?
No Start
130
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin injectors are supplied from main relay. The main relay has a voltage supply.
Is the main relay switching on when the engine is cranked?
No Start
131
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin injectors are supplied from main relay. The main relay has a voltage supply. The main relay is switching on when engine is cranked.
Is there continuity from main relay output to injectors?
No Start
132
Vehicle has spark but no injection pulse, there is no voltage at the injector supply pin injectors are supplied from main relay. The main relay has a voltage supply. The main relay is switching on when engine is cranked.
There is continuity from the main relay output to the injectors.
Are the relay contacts contacting?
No Start
133
Vehicle has spark but no injection pulse, there is no voltage supply at the injector. Voltage is supplied to the injectors from the main relay. The main relay has a voltage supply. The main relay is switching on when engine is cranked. There is continuity from the main relay output to the injectors.
The relay is damaged.
Replace relay if confident otherwise bridge relay contacts to confirm diagnosis.
Bridge relay
No Start
134
Procedure to bridge main relay
voltage kkkkkkkkkkkkkkkkkkkkkkkk.
No Start
135
Vehicle has spark at plugs and injection pulse.
Does the vehicle have fuel pressure?
No Start
136
Vehicle has spark at plugs, injection pulse but no fuel pressure.
Is there voltage at the pump when the vehicle is cranked?
No Start
137
Vehicle has spark at plugs, injection pulse but no fuel pressure and no voltage at fuel pump terminals.
Is there voltage at fuel pump relay.
No Start
138
Vehicle has spark at plugs, injection pulse, no fuel pressure, there is voltage at fuel pump terminals.
If voltage is supplied directly to the pump is there fuel pressure?
Yes ****volt drop edit
No ***dead pump edit
Help
No Start
139
Vehicle has spark at plugs, injection pulse and fuel pressure.
Does vehicle have fuel flow?
No Start
140
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Does the vehicle have compression?
Vehicle has fuel pressure and flow.
No Start
141
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression.
Disconnect the injectors so that no fuel passes through the injectors.
Continue to next step.
No Start
142
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors.
Crank the engine to remove all traces of fuel.
Mechanical test
Continue to next step.
No Start
143
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors.
Spray a small amount of easy start into the intake manifold while cranking the engine..
Mechanical test
Does the engine try to start?
No Start
144
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors. A small amount of easy start has been sprayed into the intake manifold while cranking the engine.
The engine tries to start.
Mechanical test
The engine may be over fueling or under fueling. Check injector pulse width and duty cycle.Is injector pulse width and duty cycle within parameters?
No Start
145
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors. A small amount of easy start has been sprayed into the intake manifold while cranking the engine.
The engine is not showing any signs of trying to start.
Check to see if the spark plugs are fouled or wet.
Mechanical test
Are the spark plugs fouled or wet?
No Start
146
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors. A small amount of easy start has been sprayed into the intake manifold while cranking the engine.
The engine is not showing any signs of trying to start.
The spark plugs are fouled or wet.
Mechanical test
Dry, clean or replace the plugs. Spray easy start into the inlet manifold while the vehicle is being cranked. Does the vehicle try to start?
No Start
147
Vehicle has spark at plugs, injection pulse and fuel pressure and fuel flow.
Vehicle has compression. The fuel system has been disabled by disconnecting the injectors. A small amount of easy start has been sprayed into the intake manifold while cranking the engine.
The engine is not showing any signs of trying to start. The spark plugs are not wet or fouled.
Mechanical test
Is the ignition timing correct? Next ask about valve timing? Discuss also That if there are no sign of firing that the valve timing may be out even though the Compression is okay?
No Start
148
Vehicle has spark, injection pulse and fuel pressure. It does not have fuel flow.
Is the return line blocked, does it have a return line???????
Vehicle does not have fuel flow
No Start
149
The vehicle has no spark at the plugs
The vehicle has injection pulse
What type of ignition system does the vehicle use?
Distributer
Coil over Plug
Coil Pack
Vehicle has no sparkNo Start
150
Testing individual components
No Start
151
Ignition Coils.
Ignition Modules.
Cam and Crank Position Sensors.
Basic theory
152
Conventional Ignition Coils.
Distributor-less Ignition Coils.
Coil Over Plug Ignition Coils (COP)
Ignition coil theory menu
153
Conventional ignition coils Oil filled ignition coils are basically two coils of wire, a primary coil a and a
secondary coil wrapped around a soft iron core, they are oil filled for cooling.
Transformer type ignition coils primary and secondary windings are constructed around a laminated steel frame. Some types of transformer ignition coils are fully encapsulated by resin. Look for cracking and carbon tracking on the outside of resin encapsulated coils. When testing, if these coils fail to produce a spark, listen for internal shorting within the coil.
In both oil filled and transformer type ignition coils the secondary coil has substantially more windings than the primary coil, making the arrangement a step up transformer. One side of the primary coil is connected to the positive side of the vehicle battery. The other side of the primary coil is connected to the ignition module. The ignition module switches the negative side of the coil to ground.
Conventional ignition coil theory
154
When the ignition module switches the negative side of the coil to ground, current flows into the primary windings. The primary windings behave like an electromagnet. This magnetism in the coil resists the flow of current until no more current can flow into the coil, this condition is called “fully saturated”. When the ignition module switches off the primary circuit, the magnetic field in the primary windings rapidly collapses engulfing the secondary coil windings. This collapsing magnetic field induces a high voltage in the secondary coil windings and is dissipated through the soft iron core / laminated steel frame. The soft iron core / laminated frame is part of the coil output tower, that carries the high voltage to the distributor, leads and plugs.
Conventional ignition coil theory
155
Include more images
156
Distributor-less Ignition coils (DIS) are double ended and fire two sparks simultaneously. One spark fires the cylinder on compression stroke and the other to the paired cylinder on exhaust stroke. When the spark from a DIS coil fires a cylinder that is in its exhaust stroke it is referred to as WASTE SPARK .
DIS coils are mainly of the transformer resin filled type construction.
Distributor less ignition coil theory
157
Include more images
Image of distributor less ignition coil
158
The vehicle has no spark at the plugs
The vehicle has injection pulse
The vehicle uses a distributer type ignition system
Is the ignition coil working?
Vehicle has no spark
159
The vehicle has no spark at the plugs
The vehicle has injection pulse
The vehicle uses a COP type ignition system
Is spark loss on every plug
Vehicle has no spark
160
The vehicle has no spark at the plugs
The vehicle has injection pulse
The vehicle uses a coil pack type ignition
Is spark loss on every plug?
Vehicle has no spark
161
Vehicle has no spark at plugs
Vehicle has no injection pulse
Vehicle does not have battery voltage at the injectors
Is there a 12 volt supply to the injector?
No spark no injection pulse
162
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