DTC A016: ABS Enable Relay Coil Circuit Open

DIAGNOSTIC TROUBLE CODE (DTC) A016 ABS ENABLE RELAY COIL CIRCUIT OPEN





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 All 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 detects an open in the enable relay coil circuit. If for 0.056 seconds the enable relay input voltage to the controller falls below 7.5 volts while the controller output for the enable relay is less than 3.4 volts, a fault exists.

Cause(s)
- The enable relay coil is open.
- An open exists within the enable relay coil circuit.
- There is high resistance in the connector terminal or wiring.
- The driver circuit in the EBCM is malfunctioning.

Fail Action
This is a critical operational fault. The ABS is disabled and the ABS warning lamp is turned on. The brake warning lamp is turned on only if the rear piston is not at the top of the bore, This could cause degradation of the base brakes.

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 step ensures that there is continuity through the pull-in coil of the relay.
3. This step checks to ensure that voltage is available to the pull-in coil of the relay.
4. This step checks for continuity in circuit PNK
5. 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 A016 - ABS Enable Relay Coil Circuit Open