4WAL LG

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: askus@cars-council.ca

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

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:

________________________________________________________________________

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

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

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: ______________________________________

________________________________________________________________________

Pump Motor RelayThe Pump Motor Relay is located: ___________________________________________

High Pressure AccumulatorThe purpose of a high-pressure accumulator is:________________________________________________________________________

________________________________________________________________________

EHCU-bottom view

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

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_________________________________________________________________

________________________________________________________________________

Modes of Operation

4WAL IN NON-ANTILOCK MODE

Colour in the flow of brake fluid

NOTES_________________________________________________________________

________________________________________________________________________

4WAL DURING PRESSURE HOLD MODE

NOTES_________________________________________________________________

________________________________________________________________________

4WAL IN PRESSURE DECREASE MODE

NOTES_________________________________________________________________

________________________________________________________________________

4WAL IN PRESSURE INCREASE MODE

NOTES_________________________________________________________________

________________________________________________________________________

System Diagnostics þ

Customer Information þ

List some of the comments or concerns that your customers may have regarding their

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.

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: _______________________________________

________________________________________________________________________

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. _________________________________

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_________________________________________________________________

________________________________________________________________________

4WAL LG

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