C1278

DTC C1278 Wiring Diagram:

DTC C1278 (Part 1 Of 2):

DTC C1278 (Part 2 Of 2):

CIRCUIT DESCRIPTION
When the EBTCM detects excessive wheel spin, it will request that the PCM reduce engine torque via a high speed pulse width modulated (PWM) signal on circuit 463.

CONDITIONS FOR SETTING THE DTC
If PCM codes are present, the malfunction may not exist with the ABS/TCS system.

The DTC C1278 sets when the EBTCM receives a communication failure data message from the PCM.

The DTC C1278 sets under the two following conditions:
^ EBTCM to PCM communications
CKT 463 or CKT 800 is open or shorted
^ PCM driveability conditions that would set any
PCM codes

ACTION TAKEN WHEN THE DTC SETS
The following actions are taken when the DTC sets:
^ A malfunction DTC is stored
^ The TCS is disabled
^ The TRACTION OFF indicator lamp is turned ON

CONDITIONS FOR CLEARING THE DTC
The DTC will be cleared under following conditions:
^ Conditions for the malfunction are no longer present. Use the Scan Tool Clear DTCs function.
^ 100 ignition switch key cycles have passed with no malfunctions detected.

DIAGNOSTIC AIDS
Perform a thorough inspection of the wiring and the connectors.

Failure to carefully inspect wiring may result in misdiagnosis. A misdiagnosis may result in part replacement with reappearance of the malfunction.

Thoroughly inspect the following grounds:
^ G101
^ G102
^ G106
^ G110