Antilock Brake System

CIRCUIT DIAGRAM





INSPECTION PROCEDURE

CIRCUIT DESCRIPTION:
These DTCs will diagnose a motor that is energized longer than expected. This could occur if a wheel speed sensor is malfunctioning, the motor does not turn, the front solenoid mechanically fails to open or the motor wires are crossed.

FAILURE CONDITION:
DTCs 52 and 53 can be set only during an Antilock Brake System (ABS) stop. If the Electronic Brake Control Module (EBCM) commands the front channel in release for three seconds, a malfunction exists.

DIAGNOSTIC AIDS:
An "intermittent" malfunction may be caused by a sticking, binding or slipping mechanical part of the system.
The frequency of the malfunction can be checked by using the enhanced diagnostic function of the TECH-1 as described in "TECH-1 Diagnostics". DTCs 52 and /or 53 may fail if on ice and the steering wheel is turned to lock during braking. Using the TECH-1, perform the hydraulic test to ensure that the total brake system is functional.
Any circuitry that is suspected of causing the intermittent malfunction should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wiring connections or physical damage to the wiring harness.