DTC 57

DTC 57 Left Front ABS Motor Circuit Shorted To Ground:

DTC 57 Left Front ABS Motor Circuit Shorted To Ground:

Circuit Description:
This DTC identifies an ABS motor circuit that is shorted to ground. This malfunction will not allow the ABS motor to be controlled at the commanded current rate or will cause the driver circuit to allow current directly to ground.

DTC Will Set When:
DTC 57 can be set anytime. If the EBCM detects an out of range voltage on either of the left front ABS motor circuits indicating a circuit shorted to ground, a malfunction exists.

Action Taken:
A malfunction DTC is stored, ABS is disabled and the ABS warning lamp is turned "ON."

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks for a short to ground in the ABS motor "HIGH" circuitry.
2. Checks for a short to ground in the ABS motor "LOW" circuitry.
3. Checks for an ABS motor that is internally shorted to ground.
4. Ensures malfunction was not due to physical damage of the circuitry.

Diagnostic Aids:
Using Tech 1, select manual control function, and exercise ABS motor movement of affected channel in both directions while applying light pressure on the brake pedal.

If erratic or "jumpy" brake pedal movement is detected while performing an "apply" or "release" function of the ABS motor, an intermittent malfunction may be indicated.

An "Intermittent" malfunction may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

If the malfunction is not current, wiggle the wires of the affected channel and check if the DTC resets. This will help to pinpoint an intermittent malfunction in the motor circuitry or connections.

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

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.