Antilock Braking System (ABS)

52 LEFT FRONT ABS CHANNEL IN RELEASE TOO LONG

DTC 52 Left Front Channel In Release Too Long:

DTC 52 Left Front 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, the left front solenoid mechanically fails open, or the ABS motor wires are crossed.

DTC Will Set When:
DTC 52 can be set only during an ABS stop. If the EBCM commands the left front ABS channel in release for three seconds, a malfunction exists.

Action Taken:
A malfunction DTC is stored, ABS is disabled and 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 problem in a wheel speed sensor that may cause the system to be in release too long.
2. Identifies an ABS motor as being failed or wired incorrectly.
3. Checks for a solenoid that may have mechanically failed open.
4. Verifies proper solenoid operation.
5. This serves to isolate the cause of the hydraulic problem, to either the solenoid or the ABS hydraulic modulator assembly.
6. Determines whether a malfunctioning ABS motor pack or hydraulic modulator is the reason for DTC 52 being set.

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.

DTC 52 may occur if on ice and steering wheel is turned to lock during braking. 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.