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CAN COMMUNICATION
CAN COMMUNICATION
System DescriptionINFOID:0000000005928437
Refer to
LAN-7, "System Description".
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TROUBLE DIAGNOSIS
How to Perform Trouble Diagnosis for Quick and Accurate RepairINFOID:0000000005928438
INTRODUCTION
The ABS system has an electronic control unit to control major func-
tions. The control unit accepts i nput signals from sensors and con-
trols actuator operation. It is also important to check for air leaks in
the booster or brake and vacuum lines, lack of brake fluid, or other
malfunctions in the brake system.
It is much more difficult to diagnose a malfunction that occurs inter-
mittently rather than continuously. Most intermittent conditions are
caused by poor electrical connec tions or damaged wiring. In this
case, careful checking of suspicious circuits may help prevent the
replacement of good parts.
A visual check only may not find t he cause of the malfunction, so a
road test should be performed.
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with an ABS complaint. The customer
is a very good source of information, especially for intermittent condi-
tions. Through the talks with the cu stomer, find out what symptoms
are present and under what conditions they occur.
Start your diagnosis by looking fo r “conventional” malfunctions first.
This is one of the best ways to troubleshoot brake malfunctions on
an ABS equipped vehicle. Also check related Service Bulletins for
information.
SEF233G
SEF234G
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BRC-10
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TROUBLE DIAGNOSIS
WORK FLOW
CLARIFY CONCERN
AWFIA0086GB
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• A customer's description of a vehicle concern may vary depending on the individual. It is important to clarify the customer's concern.
• Ask the customer about what symptoms are present under what
conditions. Use this information to reproduce the symptom while
driving.
• It is also important to use the diagnosis sheet to understand what
type of symptoms the customer is experiencing.
EXAMPLE OF DIAGNOSIS SHEET
SBR339B
SFIA3264E
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TROUBLE DIAGNOSIS
Component Parts and Harn ess Connector Location
INFOID:0000000005928439
1. Front wheel sensor LH E51
Front wheel sensor RH E52 2. Rear wheel sensor LH B123
Rear wheel sensor RH B124 3. ABS actuator and electric unit (con-
trol unit) E33
4. Combination meter M24 5. Stop lamp switch E13
AWFIA0619GB
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SchematicINFOID:0000000005928440
ABFWA0157GB
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BRC-14
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TROUBLE DIAGNOSIS
Wiring Diagram - ABS -
INFOID:0000000005928441
ABFWA0158GB
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WFWA0420E
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