DTC A017: ABS Enable Relay Coil Circuit Shorted to Ground

ABS ENABLE RELAY COIL CIRCUIT SHORTED TO GROUND





Circuit Description
Ignition voltage is supplied through terminal 85 of the ABS enable relay socket. The electronic brake control module (EBCM) then is able to energize the pull-in coil by completing the ground circuit at pin Al I of the EBCM. The magnetic field created closes the ABS enable relay contacts and supplies battery voltage and current to the EBCM, which supplies power to the motors.

Diagnosis
This test determines a situation in which switched battery power is greater than 7.5 volts at the EBCM for at least 4 seconds after the relay is de-energized and the relay coil is shorted to ground. The relay coil is considered shorted to ground when the coil circuit voltage at the controller is less than 4.5 volts.

Cause(s)
- The relay coil circuit is shorted to ground.
- The EBCM driver circuit is malfunctioning.

Fail Action
This sets a history code.

Test Description
The number(s) below refer to step(s) on the diagnostic table.
1. This step indicates if the EBCM is capable of controlling the ABS enable relay as commanded.
2. This checks to ensure the ABS enable relay or control circuit PNK is not shorted to ground.
3. This test determines whether the fault is due to a short to ground in circuit PNK or a faulty ABS enable relay.
4. This step ensures that the DTC was not set due to a poor connection.

Diagnostic Aids
An intermittent malfunction may be caused by a poor connection, wire insulation that has been rubbed through, or a wire that is broken inside the insulation.
The frequency of the malfunction can be checked by using the enhanced diagnostic function of the scan tool as described in "Scan Tool Diagnostics."Scan Tool Diagnostics
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.





DTC A017 - ABS Enable Relay Coil Circuit Shorted to Ground