DTC 54

Code 54: Rear ABS Channel In Release Too Long.:

DTC 54 Rear ABS Channel In Release Too Long:

Circuit Description:
This DTC will diagnose an ABS motor that is energized longer than expected. This could occur if a wheel speed sensor is malfunctioning, the ABS motor does not turn, or the ABS motor wires are crossed.

DTC Will Set When:
DTC 54 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. The amber ABS warning lamp is turned "ON."

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Identifies a malfunction in a wheel speed sensor that may cause the system to be in release too long.
2. Checks for a wheel that may stick or bind because of a mechanical malfunction.
3. Checks to see if the ABS motor is capable of moving and applying the hydraulic piston for the rear wheels.
4. Ensures that the ABS motor wiring is not crossed.
5. Isolates the fault of a "no-apply" situation to either the ABS 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 of 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.