DTC 16

DTC 16 Enable Relay Coil Circuit Open:

CIRCUIT DESCRIPTION
Ignition voltage is supplied through terminal "86" of the ABS enable relay. The EBCM then is able to energize the pull-in coil by completing the ground circuit at Pin "22" of the EBCM. The magnetic field created closes the enable relay contacts and allows battery voltage and current to be supplied to the EMB's and EBCM, which supplies power to the motors and solenoids.

FAILURE CONDITION
DTC A016 can be set only after DTC A014 has been set. This test detects an open in the enable relay coil circuit. An open in this circuit will not allow the enable relay to be energized thus preventing voltage/current to the motors, EMB's and solenoids. If this malfunction is present and the ignition is turned "OFF" before 5 km/h (3 mph) is reached, DTC A014 is set alone.

ACTION TAKEN
A malfunction DTC is stored, ABS is disabled and the ABS indicator lamp is turned "ON."

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step indicates if the EBCM is capable of controlling the enable relay as commanded.
2. This step ensures that there is continuity through the pull-in coil of the enable relay.
3. This step checks to ensure that voltage is available to the pull-in coil of the enable relay.
4. This step checks continuity in CKT 879.
5. This step ensures DTC was not set due to a poor connection.

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.

If the frequency of the malfunction is high, but is currently intermittent, check for high coil resistance by measuring resistance between relay terminals "86" and "85". If resistance is greater than 100 ohms, replace the relay.

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.