X-431 GDS Scopebox Manual en - Launch Tech USA ... X431 GDS Scopebox Manual 1 Contents 1 Foreword 3 1.1 Product summary 3

V1.00.000

2011-08-05

LAUNCH X431 GDS Scopebox Manual

ii

All rights reserved! No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means of electronic, mechanical, photocopying and recording or otherwise, without the prior written permission of LAUNCH.

This manual is designed only for the use of this unit. LAUNCH is not responsible for any use of this manual on the other units.

The manual and all the samples herein can be changed without prior notice. Neither LAUNCH nor its affiliates shall be liable to the purchaser of this unit or third parties for damages, losses, costs or expenses incurred by purchaser or third parties as a result of: accident, misuse, or abuse of this unit, or unauthorized modifications, repairs, or alterations to this unit, or failure to strictly comply with LAUNCH operating and maintenance instructions.

LAUNCH shall not be liable for any damages or problems arising from the use of any options or any consumable products other than those designated as Original LAUNCH Products or LAUNCH Approved Products

Notice: other product names used herein are for identification purposes only and may be trademarks of their respective owners. LAUNCH disclaims any and all rights in those marks.

This device is only for professional technicians and maintenance personnel.


iii

Registered Trademark

LAUNCH is a registered trademark of LAUNCH TECH. CO., LTD. (LAUNCH) in China and other countries. In other countries where any of the LAUNCH trademarks, service marks, domain names, logos and company names is not registered, LAUNCH claims other rights associated with unregistered trademarks, service marks, domain names, logos and company names. Other products or company names referred to in this manual may be trademarks of their respective owners. You may not use any trademarks, service marks, domain names, logos or company name of LAUNCH or any third party without permission from the owner of the applicable trademarks, service marks, domain names, logos or company name. You may visit LAUNCH at http://www.cnlaunch.com for the information of Launch's and the other specialized diagnostic tools, or contact Launch by visiting http://www.X431.com or writing to Customer Center, LAUNCH TECH. CO., LTD., Launch Industrial Park, North of Wuhe Avenue, Banxuegang, Bantian, Longgang, Shenzhen, Guangdong. P.R. China, to request written permission to use materials on this manual for purposes or for all other questions relating to this manual.


iv

Precaution on Operation

The appliance is a sophisticated electronic device, never have it clashed when in use.

Main unit screen may flash at the moment of engine ignition, which is normal.

You may unplug the main unit if the program can not be actuated or confused screen occurs. Plug again to continue the operation.

Make sure the appliance is properly connected to the DLC to avoid communication interruptions.

During operation, keep the screen upward and leveled. Be careful when plugging and unplugging the main cable and diagnostic

connector. Tighten the screw before operation to avoid unexpected disconnecting and/or damage to the port.

Handle with care. Avoid collision. Unplug the power after operation. Do not insert or pull the GDS card when the main unit is powered on. After the operation, the stylus shall be inserted into the hole on the back

of the main unit, and put away the cable and connector, etc accessories to the box to avoid the lost.

Unplug the power cable by holding the connector, not the cable itself


1

Contents 1 Foreword...................................................................................................................3

1.1 Product summary ...............................................................................................3 1.2 Product Feature..................................................................................................4 1.3 Product function .................................................................................................4 1.4 Technical parameters .........................................................................................4

2 Structure and Accessories......................................................................................5

2.1 Scopebox structure ............................................................................................5 2.2 Scopebox accessories .......................................................................................6

3 Automotive Oscilloscope ........................................................................................8

3.1 Connection .........................................................................................................8 3.2 Initial interface introduction.................................................................................8 3.3 Operational guidelines......................................................................................10

3.3.1Channel selection and attributes setting....................................................10 3.3.2 Trigger setting ...........................................................................................12 3.3.3 Auto calibration .........................................................................................15 3.3.4 Show and hide the Grid ............................................................................15 3.3.5 Channel measurement .............................................................................16 3.3.6 Expert settings ..........................................................................................18 3.3.7 Horizontal trigger hold-off setting ..............................................................19 3.3.8 System setting menu ................................................................................19 3.3.9 Waveform graphics storage ......................................................................20 3.3.10 Waveform storage...................................................................................21


2

3.3.11 Waveform record.....................................................................................22 3.3.12 Waveform import and playback ..............................................................23 3.3.13 Waveform printing...................................................................................25 3.3.14 View cached waveforms .........................................................................25 3.3.15 View help file...........................................................................................26 3.3.16 View version information.........................................................................27

4 Automotive Ignition waveform..............................................................................28

4.1 Primary-distributor ignition analysis..................................................................29 4.2 Primary-simultaneous ignition analysis ............................................................32 4.3 Primary-direct ignition analysis.........................................................................33 4.4 Secondary-distributor ignition analysis .............................................................34 4.5 Secondary-simultaneous ignition analysis .......................................................37 4.6 Secondary-direct ignition analysis ....................................................................40 4.7 Waveform analysis mode .................................................................................43


3

1 Foreword

1.1 Product summary

X-431 GDS is a new generation of sophisticated and integrated Automotive diagnose product with colorful screen and powerful functions developed by LAUNCH, and Scopebox is an optional function box for GDS, including Automotive oscilloscope and Automotive ignition waveform.

Automotive oscilloscope can make the auto repair technician quickly judged the faults on automotive electronic equipment and wiring， and the oscilloscope sweep speed is far greater than the signal frequency of such vehicles, usually 5-10 times of the measured signal. The automotive oscilloscope not only can quickly capture the circuit signal, but also can slowly display the waveform to observe and analyze. It can also record and store the tested signal waveform which can be played back to observe for the fast signal, having great convenience to failure analysis. Either high-speed signal (e.g.: injection nozzle, intermittent fault signal) or the slow-speed signal (e.g. the throttle position change and the oxygen sensor signal) can be observed through automotive oscilloscope in an appropriate waveform.

The electronic signal can be compared and judged via measuring five parameters indexes. The five parameters indexes are the amplitude (the maximum voltage of signal), the frequency (the cycle time of signal), the shape (the appearance of signal), the pulse width (the duty cycle or the time range of signal), and the array


4

(the repetition characteristic of signal), which can be tested, displayed, saved by the automotive oscilloscope. Via the waveform analysis can further detect the circuit fault on sensors, actuators, circuits, and electronic control units, etc.

1.2 Product Feature Fast capture the circuit signal. Display waveform slowly for observe and analysis. Record and store the tested signal waveform convenient for failure analysis. Detect, display and store all the electrical signal of amplitude, frequency,

shape, pulse width, array five parameters. 1.3 Product function

Automotive specialized oscilloscope function and ignition waveform analysis

1.4 Technical parameters

Scopebox: 4 channels, highest sampling frequency 150MHZ, max storage depth 64MSa, 8-bit resolution


5

2 Structure and Accessories

2.1 Scopebox structure

Fig 2-1 Scopebox Structure Diagram

Table 2-1 shows the ports and indicators for X-431 GDS Scopebox

SN Name Description 1 CH1 Channel 1 2 CH2 Channel 2 3 CH3 Channel 3 4 CH4 Channel 4 5 External trigger External trigger signal 6 Fixed signal

generator Generate a square signal with fixed 1K frequency

7 Power indicator Oscilloscope power indicator, which will be steady red after the oscilloscope is powered on


6

8 Operating indicator

The indicator will be steady green after the oscilloscope operated.

9 Communication indicator

After the data communication, the indicator will blink (Green).

10 Power interface Connect to power supply via the power adapter. 11 B-shaped USB

interface Connect main unit via USB connect line as separated individual USB devices

2.2 Scopebox accessories

Scopebox accessories include the Secondary pickup cable for 4-channel oscilloscope, Crocodile clips for 4-channel oscilloscope,etc. As the product configuration can be different, the accessories included with the product may differ from the accessories listed on this manual. Please see the packing list attached to the product for the detailed accessories. Following are the figures for various test cable and related accessories:

Fig .2- 2 Secondary pickup cable for 4-channel oscilloscope


7

Fig. 2-3 Crocodile clips for 4-channel Fig 2-4 Direct ignition extend wire

Oscilloscope

Fig.2-5 6-Way universal guide line for 4-channel oscilloscope

Fig.2-6 BNC to 4mm connector test cable

Fig.2-6 Pin connector for 4-channel oscilloscope


8

3 Automotive Oscilloscope

3.1 Connection

X-431 GDS Scopebox shall work with the main unit module. Firstly, power on the main unit module (the power adapter shall connect the power interface of main unit module to the DC 12V power supply, which can be also powered by cigarette lighter cable and two clamps power cord). One end of ground cable of oscilloscope shall connect with external trigger channel (GND), the other end shall be grounded. One end of probe cable of oscilloscope can connect with the CH1, CH2, CH3, or CH4 on oscilloscope module (based on the required), the other end shall connect with signal terminal.

Warning: please use the special capacitance probe when diagnosing the ignition high voltage line. Do not directly connect the oscilloscope to the ignition secondary circuit.

3.2 Initial interface introduction

Figure 3-1 is running initial interface of Automotive oscilloscope function


9

Fig.3-1

As above Figure 3-1, shows the initial interface of Automotive oscilloscope X-431 GDS. Button description: [System]: shows desktop, current version, and exit the program. [Help]: displays help files for oscilloscope operations. [File]: provides the functions of import waveform, store waveform, store graphics, record waveform, print waveform, show/hide the grid, display cached interface, turn pages and clear. [Trigger]: selects one-channel trigger/trigger alternate, trigger channel source, trigger types, trigger modes, horizontal trigger hold-off setting and auto calibration. [Measure]: measures the time and the voltage for the waveforms. [Start/stop]: starts/stops the oscilloscope waveform collection. [Expert]: Provide automatic pre-setting function of Automotive specialized


10

sensor.

3.3 Operational guidelines

3.3.1Channel selection and attributes setting

<1> Channel selection

Channel selection function can provide two ways for selecting channel.

A Select corresponding channel from the menu of channel selection

B Select corresponding channel via each channle attribute button.

as follow figure 3-2:

Fig.3-2


11

<2> Channel attributes setting Including five attributes: setting

A. Channel switch selection. B. Channel voltage adjustment: + --- voltage increased one level, - --- voltage reduced one level. C. Channel time-base adjustment: + --- voltage increased one level, - --- voltage reduced one level. D. Channel phase selection. Normal phase, reverse phase. E. Channel coupling modes: Selection, DC, AC, or Ground.. as follow figure :

i. channel 1 attributes setting

Fig.3-3

ii. channel 4 attributes setting


12

Fig.3-4

3.3.2 Trigger setting

<1> Trigger source: single channel trigger and alternate trigger ,see button 【Time base】

One channel trigger: collect all channels data by triggering one channel;

Alternate trigger:： Each channel collects data separately based on its own channel triggering, only for AUTO mode

<2> Trigger channel selection: This channel must be selected when need to set for some one channel trigger mode and voltage. See button 【Trigger】

<3> Trigger type selection: edge trigger and pulse trigger, see Button 【Time base】

Edge trigger: select via Button 【edge】 with the rising edge or the falling


13

edge;

Pulse trigger: select via Button 【pulse】..

At present, there are six modes for selecting.

<4> Trigger mode selection: Auto, Normal, Single trigger modes, see Button 【Auto】.

Auto: continuous trigger. Automatically trigger when it is satisfied the trigger conditions; otherwise, the trigger will be forced by system;

Normal: continuous trigger. Trigger only when it is satisfied the trigger conditions; otherwise do not trigger.

Single: single trigger. Only trigger once when it is satisfied the trigger conditions.

<5> Horizontal trigger hold-off setting: the button can adjust five position, Micro-adjust can click display zone directly for adjusting .see button 【Hold-off 50%>】

As shown below:

iii. One-channel trigger:


14

Fig.3-5

iv. Alternate trigger

Fig.3-6


15

3.3.3 Auto calibration Click 【Auto calibration】 button, the oscilloscope will carry out automatic calibration, but the Button 【Auto calibration】will be temporary invalid during the calibrating and finished calibrating after the button become valid. As Figure 3-7 shown below

Fig .3-7

3.3.4 Show and hide the Grid Click main menu>file>【Grid】button can perform setting for open or close grid As figure 3-8 shown below


16

Fig.3-8

3.3.5 Channel measurement <1> Time-base measurement

as figure 3-9 shown:

Fig.3-9


17

Button description：【Timebase】：For mode select button,the mode is time measure mode when display time-base 【A line>】： For A\B measurement line select ,currently line selected is real line 【Left\Right move】： For time-base micro-adjust button A\B line: time measurement line。 Measurement value display zone: A display zone for time –base measurement result <2> Voltage measurement:

as Figure 3-10 shown below::

Fig.3-10

Button description：【Voltage】： For mode select button, the mode is voltage measurement mode when display voltage 【A line>】：For A\B measurement line select , currently line selected is real line


18

【Up/Down】：For voltage micro-adjust button A\B line: time measurement line. Measurement value display zone: A display zone for voltage measurement result 3.3.6 Expert settings Click Main menu->Expert to go to the expert setting interface. Expert setting interface is specially designed to measure related vehicle sensors. The osicilloscope will be pre-set based on pre-set value of this sensor after selected this sensor and confirmed The operational interface is shown as Figure 3-11 below:

Fig.3-11

As above figure shown,left side displaying is sensor list ,right side displaying is current sample waveform of sensor selected


19

3.3.7 Horizontal trigger hold-off setting Horizontal trigger hold-off means set oscilloscope horizontal trigger position .It can be set via clicking trigger icon zone or simply set via the menu. As shown on Figure 3-12

Fig.3-12

As the above shown, the yellow inverted triangle is the horizontal movement pointer, Button 【Hold-off 50%】can coarsely tune the horizontal trigger, and fine tune in the horizontal trigger hold-off zone. 3.3.8 System setting menu As Figure 3-13 shown below:


20

Fig.3-13

Button description：【Show desktop】： shift to main interface 【Wi-Fi setting】： shift to related module interface 【Current version】： display the version information of cscilloscope 【Exit programme】： The button that exit oscilloscope module software 3.3.9 Waveform graphics storage Graphics storage is to save the waveforms that the oscilloscope currently displayed as graphic file. The function can be performed when the oscilloscope stops collecting data. As Figure 3-14 shown below:


21

Fig.3-14

【Store picture】：the button for save graphics

3.3.10 Waveform storage Waveform storage is to save the waveforms that the oscilloscope currently displayed as data file which can be played back by oscilloscope. The function can be performed when the oscilloscope stops collecting data. As Figure 3-15 shown below:


22

Fig.3-15

【Store waveform】：the button for save waveform 3.3.11 Waveform record Waveform record is recording waveform that collected by oscilloscope at a period ,and save as data file which can be reviewed via importing and playing back by oscilloscope. This function can be performed when the oscilloscope stops collecting data. Click [Main menu->File->Record] to start the waveform record. As Figure 3-16 shown below:


23

Fig.3-16

【Record/Stop】： The button for start or stop recording, the recorded pages will be shown while recording. 3.3.12 Waveform import and playback Waveform import and playback means review the file that has been stored waveform record file.This operation can be carried out when the oscilloscope stops collecting data. As Figure 3-17 shown below:


24

Fig.3-17

If it is necessary to delete the waveform files, please firstly select the related file, then press Delete button. After clicked OK button to open related waveform file, adjust the waveform display via channel attributes setting or turn page via [Main menu->File->Pre pg\ Next pg], as Figure 3-18 shown below:

Fig.3-18


25

3.3.13 Waveform printing

Waveform printed means print currently displayed waveform file via the special printer, before printing, the oscilloscope shall stop collecting data and the printer shall be connected. As Figure 3-19 shown below:

Fig.3-19

3.3.14 View cached waveforms

This osicilloscope can store 10 pages cached waveform data by itself..When the oscilloscope stops collecting data, operate stored data page by click [Main menu->File->Pre pg\Next pg\Clear] As Figure 3-20 shown below:


26

Fig.3-20

3.3.15 View help file

Click [Main menu->Help] to go to Help interface. As Figure 3-21 shown below:

Fig.3-21


27

3.3.16 View version information

Click【system->version】can display current version of oscilloscope.As figure 3-22 shown:

Fig.3-22


28

4 Automotive Ignition waveform

The ignition system is the system which has greatest impact on the performances of gasoline engine, as the statistical data shows that nearly half of the failures are caused by poor work of electrical system. And the performance tests of engine often start from the ignition system. Nowadays ignition system includes distributor and distributorless. Distributorless includes independent ignition and simultaneous ignition.

1. Distributor ignition system i.e. contact breaker with contact-controlled ignition system (commonly known as the platinum) and contact breaker with noncontact-controlled ignition system combined with magnet, hall components or infrared

2. Independent ignition system: crankshaft sensor send out the ignition timing signal and cylinder identification signal so that the ignition system can send out ignition signal to specified cylinder in specified time, each cylinder has its independent ignition coil.

3. Simultaneous ignition system: two cylinders share one ignition coil, when two cylinder pistons reach top dead center at the same time (one is compression, another is the exhaust), two spark plugs will be ignited at the same time, at this time, the ignition for the former cylinder is in high-pressure low temperature gas mixture, the ignition is valid, while for the latter one is in low-pressure high temperature exhaust gas, the ignition is invalid.


29

X-431 GDS can test and analyze the primary/secondary signal for various engine ignition systems.

On the main interface, click "Engine ignition waveform" - "Configuration" to enter the interface as on Figure 4-1:

Fig.4-1

This interface includes the six items engine ignition analyses: primary-distributor ignition, primary-simultaneous ignition, primary-direct ignition, secondary-distributor ignition, secondary-simultaneous ignition, and secondary-direct ignition.

4.1 Primary-distributor ignition analysis

Tips: Generaly,the sequence of ignition is (The specific sequence is subject to the actual engine ignition sequence)


30

Four-stroke in-line four-cylinder: 1—2—4—3, or 1—3—4—2

Four-stroke in-line six-cylinder: 1—5—3—6—2—4, or 1—4—2—6—3—5

Four-stroke in-line eight-cylinder: 1—8—4—3—6—5—7—2

Five-cylinder: 1-2-4-5-3

V 6 engine: generally speaking, based on the person sitting on the driver cab, if the right side cylinder numbers on the right side, from the front to the back are as follows: 1, 3, 5; and the cylinder numbers on the left side, from the front to the back are as follows: 2, 4, 6; then the ignition sequence is: 1－4－5－2－3－6. If the cylinder numbers on the right side, from the front to the back are as follows: 2, 4, 6; and cylinder numbers on the left side, from the front to the back are as follows:1, 3, 5; then the ignition sequence is: 1－6－5－4－3－2.

The Figure 4-2 shows the normal ignition waveform of distributor ignition system, the upper one is the secondary waveform, the lower one is the primary waveform.

The section A is the opening of contact point; section B is the closing of contact point, during which the ignition coil.is charing


31

Fig.4-2

（1）Contact break point: the primary circuit of ignition coil cut off, the secondary voltage was sensed and increased sharply （2）Ignition voltage: secondary coil voltage overcome the damper of high voltage line, the contact breaker gap and the spark plug gap to release magnetizing energy, 1-2 section is the breakdown voltage; （3）Spark voltage: For the capacitor discharge voltage; （4）Ignition voltage pulse: For the charge and discharge sections; （5）Spark line: The inductance discharge process, i.e. the mutual inductance voltage of ignition coil maintains the conduction of secondary circuit; （6） Contact point close: The current flow into primary coil, the primary coil


32

oscillates due to the mutual inductance. Primary ignition waveform

a section shows the voltage oscillation on the primary circuit due to the magnetic induction of spark in the duration; b section shows the damped oscillation generated by remaining magnetic field energy after the spark; c. section shows the period of primary coil charging Seen from the waveform, the amplitudes of breaker contact closed angle, break angle and breakdown voltage and spark voltage are very clear, besides, the spark delay period and two oscillations can also be tested. For the ignition system without faults, compared with the whole cycle, the contact closed angle just 45%-50% (four-cylinder), 63%-70% (six-cylinder), or 64%-71% (eight-cyliner); the breakdown voltage is over 15kv; the spark voltage is about 9kV, the spark period is greater than 0.8ms. If these values or waveform are abnormal, it means there is fault or the system needs to be adjusted.

4.2 Primary-simultaneous ignition analysis

The Figure 4-3 below shows the valid and invalid ignition waveforms. Under the working status of valid ignition, the breakdown voltage and spark voltage are higher due to the cylinder was filled fresh combustible mixture gas, which has a lower ionization level; vice versa; the above-mentioned shall be distinguished during testing.


33

Fig.4-3

4.3 Primary-direct ignition analysis

The Figure 4-4 shows the normal secondary (the upper one) and (the lower one) primary ignition waveform of direct ignition system. Beause the on-off of primary circuit is not open and close of mechanical contact, but is the conduction of transistor, the primary voltage hasn't obvious oscillation within the duration, while the voltage was increased during the magnetization process due to current limiting, and this change can cause corresponding fluctuations of secondary voltage line due to the ignition coil sensing.


34

Fig.4-4

4.4 Secondary-distributor ignition analysis

Connections: The secondary ignition line BNC connect one end of oscilloscope module of CH1/CH2/CH3/CH4 channel, the other end secondary high-voltage connect center of high-voltage line, crocodile clip connect vehicle-body After properly connected, powered on, and made sure the cylinder number and ignition sequence, the interface will be shown as Figure 4-5:


35

Fig.4-5

Tips: Common ignition sequence (the specific sequence is subject to the actual engine ignition sequence) Four-stroke in-line four-cylinder: 1—2—4—3, or 1—3—4—2 Four-stroke in-line six-cylinder: 1—5—3—6—2—4, or 1—4—2—6—3—5 Four-stroke in-line eight-cylinder: 1—8—4—3—6—5—7—2 Five-cylinder: 1-2-4-5-3 V 6 engine: generally speaking, based on the person sitting on the driver cab, if the right side cylinder numbers on the right side, from the front to the back are as follows: 1, 3, 5; and the cylinder numbers on the left side, from the front to the back are as follows: 2, 4, 6; then the ignition sequence is: 1－4－5－2－3－6. If the cylinder numbers on the right side, from the front to the back are as follows: 2, 4, 6; and cylinder numbers on the left side, from the front to the back are as follows:1, 3, 5; then the ignition sequence is: 1－6－5－4－3－2.


36

The Figure 4-6 below shows the normal ignition waveform of distributor ignition system, the upper one is the secondary waveform, and the lower one is the primary waveform. The secondary waveform, A section is contact open period; B section is make contact period, which is the magnetizing field of ignition coil.

Fig.4-6

（1）Contact break point: the primary circuit of ignition coil cut off, the secondary voltage was sensed and increased sharply （2）Ignition voltage: secondary coil voltage overcome the damper of high


37

voltage line, the contact breaker gap and the spark plug gap to release magnetizing energy, 1-2 section is the breakdown voltage （3）Spark voltage: For the capacitor discharge voltage （4）Ignition voltage pulse: For the charge and discharge sections （5）Spark line: The inductance discharge process, i.e. the mutual inductance voltage of ignition coil maintains the conduction of secondary circuit （6）Contact point close the current flow into primary coil, the primary coil oscillates due to the mutual inductance. Primary ignition waveform

a. section shows the voltage oscillation on the primary circuit due to the magnetic induction of spark in the duration; b. section shows the damped oscillation generated by remaining magnetic field energy after the spark; c. section shows the make contact magneting period of primary coil. Seen from the waveform, the amplitudes of breaker contact closed angle, break angle and breakdown voltage and spark voltage are very clear, besides, the spark delay period and two oscillations can also be tested. For the ignition system without faults, compared with the whole cycle, the contact closed angle just 45%-50% (four-cylinder), 63%-70% (six-cylinder), or 64%-71% (eight-cyliner); the breakdown voltage is over 15kv; the spark voltage is about 9kV, the spark period is greater than 0.8ms. If these values or waveform are abnormal, it means there is fault or the system needs to be adjusted.

4.5 Secondary-simultaneous ignition analysis

Connections: The secondary ignition wire BNC connect one end of oscilloscope


38

module of CH1/CH2/CH3/CH4 channel, the other end secondary high-voltage connect center of high-voltage line, crocodile clip connect vehicle-body Connection as shown in figure 4-7：

Fig.4-7 After properly connected, powered on, the interface of secondary-simultaneous ignition will be shown as Figure 4-8


39

Fig.4-8

The Figure 4-9 below shows the valid and invalid ignition waveforms. Under the working status of valid ignition, the breakdown voltage and spark voltage are higher due to the cylinder was filled fresh combustible mixture gas, which has a lower ionization level; vice versa; the above-mentioned shall be distinguished during testing.


40

Fig.4-9

4.6 Secondary-direct ignition analysis

Connection： 1）When the high-voltage wire was exposed, the secondary ignition wire BNC connect the CH1/CH2/CH3/CH4 channel of oscilloscope module, the other end secondary high-voltage wire connect center high-voltage, crocodile clip connect vehicle-body. 2）When the high-voltage wire wasn’t exposed, dismantle ignition coil tested cylinder, utilize direct ignition extend wire. One end insert into cylinder connection spark plug and ignition coil connect vehicle-body through direct ignition connect ground wire, then utilize the secondary ignition wire BNC connect the CH1/CH2/CH3/CH4 channel of oscilloscope module, the other end secondary high-voltage wire connect center high-voltage, crocodile clip connect vehicle-body Connection as shown in figure 4-10:


41

Fig.4-10 The secondary direct ignition interface as follow figure 4-11

Fig.4-11


42

The Figure 4-12 below shows the normal secondary (the upper one) and (the lower one) primary ignition waveform of direct ignition system. Beause the on-off of primary circuit is not open and close of mechanical contact, but is the conduction of transistor, the primary voltage hasn't obvious oscillation within the duration, while the voltage was increased during the magnetization process due to current limiting, and this change can cause corresponding fluctuations of secondary voltage line due to the ignition coil sensing.

Fig.4-12


43

4.7 Waveform analysis mode

The ignition secondary single-cylinder waveform test is mainly used to:

a. Analyze the ignition dwell angle of single cylinder.(ignition coil charging time)

b. Analyze the capability of ignition coil and secondary high tension circuit.(from ignition line to ignition voltage line)

c. Find the improper mixture A/F ratio of single cylinder.(from combustion line)

d. Analyze the capability of capacitance.(platinum or ignition system)

e. Find the spark plug that causes the misfire of cylinder. (from combustion line)

This test can provide very meaningful information about the combustion quality for each cylinder. If necessary, this test can also be performed during driving. As the secondary ignition waveform significantly affected by different engine, fuel system and ignition conditions, it is useful for detecting the faults of engine mechanical parts and fuel system components, and ignition system components. Different parts of the waveform can specify that some components and systems on the specific cylinder have faults. Refer to the instructions for various parts of waveform for the related component working status of specific waveform section.

Test methods and conditions:

Start the engine or drive the vehicle accroding to the fault of driving performance or the poor ignition, etc. Confirm the consistence of judgement standard (the amplitude, frequency, shape and pulse width, etc., for each cylinder), check the


44

fault on particular part of the waveform for corresponding components.

Waveform results: observe the ignition coil at the beginning of charging, the relative consistent falling edge represents the dwell angle and ignition timing of each cylinder are precise.

Ignition line:

Observe the height consistence of flashover voltage. The too high flashover voltage (even out of the screen of oscilloscope) represents the high resistance existed in the ignition secondary circuit (due to open circuit, or damaged spark plug or high voltage line, or too large time gap on spark plug), while, the too short sparking voltage represents the resistance of ignition secondary circuit is lower than normal value (due to pollutant and broken spark plug or the high voltage line of spark plug has electrical leakage, etc.,).

Spark or combustion voltage:

Observe the consistence of spark or combustion voltage, as it represents the consistence of spark plug and the air-fuel ratio of each cylinder, if the mixing ratio is too lean, then the combustion voltage will be lower than normal value.

Combustion line:

Observe the spark or the combustion line which shall be clean with few clutter, as lots of clutter indicates the cylinder has poor ignition due to ignite too early, damaged nozzle, pollutant spark plug, or the other reasons. The duration of combustion line indicates the mixing ratio of the cylinder is abnormal lean or rich. Too long of combustion line (usually greater than 2ms) represents the mixing ratio


45

is rich, too short of combustion line (usually less than 0.75ms) represents the mixing ratio is lean.

Ignition coil oscillation:

Observe at least two oscillation waveforms after the combustion line, which will be better if more than three oscillation waveforms, as it represents the ignition coil and capacitor (on Platinum or ignition system) are normal.

Primary voltage analysis

According to the faulty primary voltage waveform collected by the ignition analysis, the related components and mechanical equipment status of ignition system electrical circuit can be analyzed, which provides a reliable basis for the adjustment and maintenance of power circuit to avoid the blind demolition.

The waveform shown on Figure 4-13, appears a lot of clutter on the contact break point, which is obviously caused by the serious erosion on contact break point. It can be verified via burnishing the contact or changing the circuit breaker.

Fig 4-13


46

The primary voltage waveform shown on Figure 4-14, the damped attenuation cycles obvious reduced on the spark period, the amplitude became lower, which obviously caused by capacitor leakage.

Fig 4-14

The waveform on Figure 4-15, shows the accident pumping on make contact period. The irregular beating is caused by insufficient spring force

Fig.4-15

The curve on Figure 4-16 shows the contact angle is too small during the magnetizing period, which is caused by too large contact gap.


47

Fig.4-16

A lot of clutter wavefore will be display on the horizontal section of primary wavefore if contact has poor ground ,as shonw below figure 4-17

Fig.4-17

The Figure 4-18 shows the fault of low-voltage waveform in electronic ignition system. The voltage did not rise during the magnetizing, which indicated that the effect of limitation of the circuit is failure, no components on distributorless ignition system can be adjusted. When this waveform is abnormal, you can only replace the ignition coils, igniter, ignition signal generator and cam position sensor, etc., one by one, to find out the faulty component or module.


48

Fig.4-18 The secondary waveform is also affected by the spark plug, the combustion process, mixture gas composition, the engine thermal state of the ignition coil, etc., which is more complicated. The following lists a large number of measured secondary faulty waveform for reference. Due to various factors will lead to the failures, the Figure 4-19 just show the major possible factors for the failures.


49


50

Fig.4-19


51

Warranty THIS WARRANTY IS EXPRESSLY LIMITED TO PERSONS WHO PURCHASE LAUNCH PRODUCTS FOR PURPOSES OF RESALE OR USE IN THE ORDINARY COURSE OF THE BUYER’S BUSINESS. LAUNCH electronic product is warranted against defects in materials and workmanship for one year (12 months) from date of delivery to the user. This warranty does not cover any part that has been abused, altered, used for a purpose other than for which it was intended, or used in a manner inconsistent with instructions regarding use. The exclusive remedy for any automotive meter found to be defective is repair or replacement, and LAUNCH shall not be liable for any consequential or incidental damages. Final determination of defects shall be made by LAUNCH in accordance with procedures established by LAUNCH. No agent, employee, or representative of LAUNCH has any authority to bind LAUNCH to any affirmation, representation, or warranty concerning LAUNCH automotive meters, except as stated herein. Disclaimer THE ABOVE WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, EXPRESSED OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.


52

Order Information Replaceable and optional parts can be ordered directly from your LAUNCH authorized tool supplier. Your order should include the following information: 1. Quantity 2. Part number 3. Item description

Customer Service Department If you have any questions on the operation of the unit, please call: +86-755-84528767 If your unit requires repair service, return it to the manufacturer with a copy of the sales receipt and a note describing the problem. If the unit is determined to be in warranty, it will be repaired or replaced at no charge. If the unit is determined to be out of warranty, it will be repaired for a nominal service charge plus return freight. Send the unit prepaid to: Attn: Customer Service Department

LAUNCH TECH. CO., LTD. Launch Industrial Park, North of Wuhe Avenue, Banxuegang, Bantian, Longgang, Shenzhen, Guangdong P.R.China, 518129

Launch website: http: //www. cnlaunch.com


53

Statement: LAUNCH reserves the rights to make any change to product designs and specifications without notice. The actual object may differ a little from the descriptions in the manual in physical appearance, color and configuration. We have tried our best to make the descriptions and illustrations in the manual as accurate as possible, and defects are inevitable, if you have any question, please contact local dealer or after-sale service center of LAUNCH, LAUNCH does not bear any responsibility arising from misunderstandings.

Documents

X-431 GDS Scopebox Manual en - Launch Tech USA ... X431 GDS Scopebox Manual 1 Contents 1 Foreword 3 1.1 Product summary 3