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INTERACTIVE DISTANCE LEARNING
ANTI-LOCK BRAKE SPECIALIST:KELSEY HAYES FOUR WHEEL
ANTI-LOCK BRAKING SYSTEMS4WAL
LEARNING GUIDECARS KNOWLEDGE NETWORK
6 – 9120 Leslie StreetRichmond Hill, ON L4B 3J9
Phone: 905-709-1694 Fax: 905-709-1013
Email: [email protected]
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KELSEY- HAYES 4WAL
Learning OutcomeUpon successful completion of this segment the participants will be able to identify andtest system and individual 4WAL components. Additionally the participant will be ableto utilize manuals and test equipment to diagnose component and system failures.
ObjectivesUpon successful completion, the participants will be able to perform the following:
1. Describe normal and ABS functions and state vehicle applications2. Locate and identify 4WAL electrical and hydraulic components and describe their
functions.3. Identify 4WAL inputs and outputs and describe their functions4. Identify 4WAL hydraulic system components and their functions5. Illustrate different modes of 4WAL braking6. Identify system and component failures by utilizing manuals and test equipment
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KELSEY-HAYES 4WAL
Kelsey Hayes four-wheel antilock (4WAL) is used on General Motor light duty trucks.List below some of the applications:______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________
Kelsey Hayes four-wheel antilock (4WAL) is classified as a:
________________________________________________________________________
The 4WAL system uses 3 separate channels and they are:
1. ____________________________________________
2. ____________________________________________
3. ____________________________________________
The term " Select Low" is used by the EBCM and it is defined as:
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
List below some of the base brake components that are used:
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
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List the components that have been added to the base brake components:
1. _______________________________________________
2. _______________________________________________
3. _______________________________________________
4. _______________________________________________
5. _______________________________________________
6. _______________________________________________
Typical 4 WAL ECHU Assembly
The EBCM has 3 different connectors and they are:
1. ______________________ - wheel speed sensors
2. ______________________ - inputs and outputs
3. ______________________ - pump and solenoids
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Electronic Brake Control Module (EBCM)The purpose of the EBCM is to:1. _____________________________________________________
2. _____________________________________________________
3. _____________________________________________________
4. _____________________________________________________
4 WAL EBCM
The EBCM is located: _____________________________________________________
Brake Pedal and Brake Switch Assembly
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The purpose of the brake switch is to: _________________________________________
________________________________________________________________________
The brake switch will input a _______________ volt input to the EBCM when the pedal
is depressed.
Pump MotorThe purpose of the pump motor is to:
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
Pump Motor
The Pump Motor is located: _______________________________________________.
Pump Motor Relay
The purpose of the Pump Motor relay is: ______________________________________
________________________________________________________________________
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Pump Motor RelayThe Pump Motor Relay is located: ___________________________________________
High Pressure AccumulatorThe purpose of a high-pressure accumulator is:________________________________________________________________________
________________________________________________________________________
EHCU-bottom view
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Hydraulic Control UnitThe purpose of the hydraulic unit or valve body is:
________________________________________________________________________
________________________________________________________________________
Pulse Width Modulation Solenoids
Wheel Speed Sensors (WSS)
The purpose of the WSS is to: _______________________________________________
________________________________________________________________________
WSS- FRONT HUB ASSEMBLY WSS- REAR SENSOR
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The WSS depending on whether it is a 3 or 4 sensor system can be located:
1. ____________________________________
2. ____________________________________
3. ____________________________________
List below some of the other components that are used and their purpose:
1. __________________ - _________________________________________________
________________________________________________________________________
2. __________________ - _________________________________________________
________________________________________________________________________
3. __________________ - _________________________________________________
________________________________________________________________________
NOTES_________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
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Modes of Operation
4WAL IN NON-ANTILOCK MODE
Colour in the flow of brake fluid
NOTES_________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
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4WAL DURING PRESSURE HOLD MODE
Colour in the flow of brake fluid
NOTES_________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
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4WAL IN PRESSURE DECREASE MODE
Colour in the flow of brake fluid
NOTES_________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
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4WAL IN PRESSURE INCREASE MODE
Colour in the flow of brake fluid
NOTES_________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
14
System Diagnostics þ
Customer Information þ
List some of the comments or concerns that your customers may have regarding their
ABS:
1. _________________________________________________________________
2. _________________________________________________________________
3. _________________________________________________________________
4. _________________________________________________________________
Road Testing and Visual Inspection þ
List some of the things that may be determined through both of these actions:
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
Amber ABS Warning Light þ
The purpose of the Amber ABS light is to:
1. _________________________________________________
2. _________________________________________________
3. _________________________________________________
The Amber ABS light will remain illuminated for approximately____________________
seconds if there are no problems.
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Red Brake Warning Lamp (RBWL) þ
The purpose of the Red Brake light is to:
1. ________________________________________________
2. ________________________________________________
3. ________________________________________________
Powers and Grounds þ
Supplied to the EBCM are 2 power inputs:
Fusible link - __________________________________________________________
Fused B+ - ___________________________________________________________
There are 3 ground circuits to be checked and they should have no more than
_______________________________________________ volts on them.
Diagnostic Trouble Codes ( DTC's ) þ
The EBCM will generate a DTC when: _______________________________________
________________________________________________________________________
________________________________________________________________________
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DTC 's can be extracted through the utilization of a Scan tool or through a manual
retrieval method that is performed by: ______________________________________
________________________________________________________________________
List below the procedure to extract DTC 's throough the utilization of blinking the Amber
ABS warning lamp:
1. ___________________________________________________
2. ___________________________________________________
3. ___________________________________________________
4. ___________________________________________________
5. ___________________________________________________
There are 2 basic code distinctions and they are:
1. _________________________________
2. _________________________________
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There are different methods of clearing DTC's and they are :
1. _______________________________________________________________
2. _______________________________________________________________
Some of the scantool tests that can be performed are:
1. ___________________________________________
2. ___________________________________________
3. ___________________________________________
4. ___________________________________________
5. ___________________________________________
Bleeding the 4WAL system may be necessary if:
1. ___________________________________________________________
2. ___________________________________________________________
3. ___________________________________________________________
NOTE: Consult Service Literature for the proper sequence and safety precauions to be
followed.
NOTES_________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
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