DTC 54

DTC 54 Rear Axle Channel In Release Too Long:

CIRCUIT DESCRIPTION
This DTC 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, or the motor wires are crossed.

FAILURE CONDITION
DTC A054 can be set only during an ABS stop. If the EBCM commands the rear axle channel in release for three seconds, a malfunction exists.

ACTION TAKEN
A malfunction DTC is stored, ABS is disabled and the ABS indicator lamp is turned "ON."

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step identifies a problem in a wheel speed sensor that may cause the system to be in release too long.
2. This checks for a wheel that may stick or bind because of a mechanical fault.
3. This checks to see if the motor is capable of moving and applying the hydraulic piston for the rear wheels.
4. This step insures that the motor wiring is not crossed.
5. This isolates the fault of a "no-apply" situation to either the motor pack or ABS hydraulic modulator assembly.

DIAGNOSTIC AIDS
An "Intermittent" malfunction may be caused by a mechanical part of the system that sticks or binds.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Tech 1.

Using the Tech 1, perform hydraulic test to ensure total brake system is functional.

Any circuitry, that is suspected as causing the intermittent complaint, 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.