DTC 78

78 RIGHT FRONT SOLENOID CIRCUIT OPEN OR SHORTED TO GROUND

DTC 78 Right Front Solenoid Circuit Open Or Shorted To Ground:

DTC 78 Right Front Solenoid Circuit Open Or Shorted Ground:

Circuit Description:
This DTC identifies a solenoid that cannot be energized due to an open in its circuitry, or a solenoid that is always energized due to a short to ground in its circuitry between the driver and the solenoid. An open will not allow proper ABS operation, but the short to ground simply turns "ON" the solenoid. A path for base brakes is still allowed once the motor rehomes and the check ball is lifted off its seat during key "ON" initialization.

DTC Will Set When:
DTC 78 can be set only when the solenoid is commanded "OFF" while the ABS relay is enabled. If the EBCM detects the right front solenoid control circuit voltage is out of specification, a malfunction exists.

Action Taken:
A malfunction DTC is stored, ABS is disabled. The amber ABS warning lamp is turned "ON."

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks for a short to ground in the control circuitry of the solenoid.
2. Checks for an open in the control circuit of the solenoid.
3. Checks the solenoid coil for proper resistance.
4. Checks for an open in the solenoid voltage supply circuit.
5. Checks for a possible intermittent malfunction in the solenoid circuitry 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.

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.