A053

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, the right front solenoid mechanically fails open or the motor wires are crossed.

Failure Condition
DTC A053 can be set only during an ABS stop. If the EBCM commands the left front channel in release for three seconds, a malfunction exists.

Action Taken
A DTC A053 is stored, ABS is disabled and the "ABS" indicator is tumed on.

Test Description
Number(s) below reter 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 step identifies a motor as being failed or wired incorrectly.
3. This step checks for a solenoid that may have mechanically failed open.
4. If Step 3 has failed, this serves to isolate the cause of the hydraulic problem to either the solenoid or the hydraulic modulator.
5. This step determines whether a malfunctioning motor pack or hydraulic modulator is the reason for DTC A053 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 as described in "TECH 1 Diagnostics." DTC A053 may fail if on ice and the steering wheel is tumed 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 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.