Antilock Braking System (ABS)

Fig. 317 Code 58: Left Front ABS Motor Circuit Shorted To Battery Or Motor Shorted.:

DTC 58 Left Front ABS Motor Circuit Shorted To Battery Or Motor Shorted:

Circuit Description:
This DTC identifies a motor circuit that is shorted to battery or a motor that has low or no resistance. This malfunction will not allow the motor to be controlled at the commanded current rate or will cause the motor to turn in the opposite direction, or not at all.

DTC Will Set When:
DTC 58 can be set anytime. If the EBCM detects an out of range voltage in either of the left front motor circuits indicating a circuit shorted to battery or a motor shorted, 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. This step checks for a short to voltage in the motor "high" circuitry.
2. This step checks for a short to voltage in the motor "low" circuitry.
3. Checks for a short between "high" and "low" motor circuits.
4. This step checks for a motor that is internally shorted.
5. Checks for a short between the EMB and motor circuits.
6. Checks for an internal motor pack short between the EMB and motor.
7. Ensures malfunction was not due to physical damage of the circuitry.

Diagnostic Aids:
Using Tech 1, select manual control function, and exercise 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 motor, an intermittent malfunction may be indicated. An "Intermittent" malfunction is most likely 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.

If DTC 38 sets as a current DTC and DTC 58 is an infrequent history DTC, see DTC 38 diagnostics. 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.