C1276

CIRCUIT DESCRIPTION
Traction Control is simultaneously controlled by the EBTCM and the Powertrain Control Module (PCM). The PCM sends a DELIVERED TORQUE message via a Pulse Width Modulated (PWM) signal to the EBTCM confirming the delivered torque level for proper Traction Control system operation. The EBTCM supplies the pull up voltage.

CONDITIONS FOR SETTING THE DTC
DTC C1276 can be set anytime when ignition voltage is present. A malfunction exists if the PWM signal is out of range or no signal is received for a period of 7 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction DTC is stored.
^ TCS is disabled.
^ Traction Control (TRAC OFF) indicator is turned on.
^ Service Vehicle Soon Indicator is turned on.
^ ABS remains functional.

CONDITIONS FOR CLEARING THE DTC
^ Condition for DTC is no longer present and scan tool clear DTC function is used.
^ 100 ignition cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
^ Possible causes for DTC C1276 to set are:
- Delivered Torque line (CKT464) open.
- Delivered Torque line (CKT464) shorted to ground.
- Delivered Torque line (CKT464) shorted to voltage.
- Communication frequency malfunction.

^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
^ If an intermittent malfunction exists refer to Intermittents and Poor Connections Diagnosis in Diagnostic Aids.