C1276

CIRCUIT DESCRIPTION
Traction Control is simultaneously controlled by the Electronic Brake and Traction Control Module (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 Pulse Width Modulated (PWM) signal is out of range or no signal is received for a period of 7 seconds.

ACTION TAKEN WHEN THE DTC SETS
TCS/Active Handling (if equipped with RPO JL4) are disabled.
^ Indicators that turn on:
- Car Icon (TCS indicator)
^ Messages displayed on the Driver Information Center (DIC):
- Service Traction System
- Service Active HNDLG (if equipped with RPO JL4)

CONDITIONS FOR CLEARING THE DTC
^ Condition for Diagnostic Trouble Code (DTC) is no longer present and Scan tool clear DTC function is used.
^ Fifty ignition cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
^ 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 Testing for Electrical Intermittents in Diagnostic Aids.
^ Possible causes for Diagnostic Trouble Code (DTC) C1276 to set:
- Open in CKT 464.
- CKT 464 shorted to ground or voltage.
- Communication frequency problem.
- Communication duty cycle problem.
- CKT 464 has a wiring problem, terminal corrosion, or poor connections.
- Electronic Brake and Traction Control Module (EBTCM) not receiving information from the Powertrain Control Module (PCM).

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
4. Checks for proper duty cycle.
5. Checks for proper frequency.

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Part 2 Of 2:

DTC C1276 DELIVERED TORQUE SIGNAL CIRCUIT MALFUNCTION