C1276

DTC C1276: Delivered Torque Signal Circuit Malfunction (Part 1 Of 2):

DTC C1276: Delivered Torque Signal Circuit Malfunction (Part 2 Of 2):

DTC C1276 Schematic:

CIRCUIT DESCRIPTION
Traction Control is simultaneously controlled by the Electronic Brake/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.

CONDITION FOR SETTING THE DTC
Diagnostic Trouble Code (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 and the TRACTION OFF indicator lamp is turned ON. ABS remains functional.

CONDITIONS FOR CLEARING THE DTC
Condition for DTC is no longer present and scan tool clear function is used. Fifty start 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. Possible causes: 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. EBTCM not receiving information from the 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.