A017

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
Ignition voltage is supplied through terminal "A2" of the ABS enable relay. The Electronic Brake Control Module (EBCM) then is able to energize the pull-in coil by completing the ground circuit at terminal "22" of the EBCM. The magnetic field created closes the enable relay contacts and allows battery voltage and current to be supplied to the EBCM, which supplies voltage to the motors and solenoids.

FAILURE CONDITION
DTC A017 can be set before the EBCM commands the enable relay "ON." This test determines if the enable relay is energized when it should not be. This malfunction would not allow the enable relay to remove power to the ABS system. If a second malfunction were to occur that requires the enable relay to be turned "OFF," that malfunction cannot be removed if the relay cannot be controlled.

ACTION TAKEN
A malfunction DTC is stored. ABS is not disabled; however the ABS indicator lamp is flashed to indicate a malfunction exists.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step indicates that the EBCM is capable of controlling the enable relay as commanded.
2. This checks to insure that the enable relay or control CKT 879 are not shorted to ground.
3. This step checks to see if the EBCM is internally shorted to ground. A grounded terminal "22" would cause the enable relay to be energized any time the ignition was in the "ON" position.
4. This step checks for a short to ground in control CKT 879 or a defective relay.

DIAGNOSTIC AIDS
An "Intermittent" malfunction may be caused by a poor connection, rubbed through wire insulation, 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 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.