Antilock Braking System (ABS)

16 ABS RELAY COIL CIRCUIT OPEN

DTC 16 ABS Relay Coil Circuit Open:

DTC 16 ABS Relay Coil Circuit Open:

CIRCUIT DESCRIPTION:
Ignition voltage is supplied through terminal "C10" of the ABS relay. The EBCM then is able to energize the pull-in coil by completing the ground circuit at connector "C1". terminal "A11" of the EBCM. The magnetic field created closes the ABS relay contacts and allows battery voltage and current through the ABS relay terminal "B10" to be supplied to the EBCM through connector "C2", terminal "C", which supplies power to the motors and solenoids.

DTC WILL SET WHEN:
DTC 16 can be set only after DTC 14 has been set. This test detects an open in the ABS relay coil circuit. An open in this circuit will not allow the ABS relay to be energized thus preventing voltage/current to the motors and solenoids. If this malfunction is present and the ignition is turned "OFF" before 5 km/h (3 mph) is reached, DTC 14 is set alone.

ACTION TAKEN:
A malfunction DTC is stored, ABS is disabled and the amber ABS warning lamp is turned "ON." The red BRAKE warning lamp is turned "ON" if the rear piston in the ABS motor pack is not in the home position.

DTC CHART TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Indicates the EBCM is capable of controlling the ABS relay as commanded.
2. Checks to ensure that voltage is available to the pull-in coil of the ABS relay.
3. Ensures that there is continuity through the pull-in coil of the ABS relay.
4. Verifies the integrity of the ABS relay control circuit.
5. Ensures malfunction was not due to poor terminal contact.

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 between relay terminals "85" and "86" using J 39200. If resistance shows greater than 100 ohms, replace the relay.

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.