C1323

DTC C1323: PCM To EBTCM Delivered Torque Circuit Malfunction:

DTC C1323 Continued:

Schematic:

Circuit Description
The Traction Control System (TCS) uses the antilock brake system in conjunction with the PCM fuel and ignition controls to limit drive wheel slippage during acceleration. The PCM controlled portion of the traction control system reduces engine torque by retarding spark timing, alternating air/fuel ratio, and/or shutting off up to three injectors. The Electronic Brake Traction Control Module (EBTCM) sends a torque request to the PCM via a Pulse Width Modulated (PWM) signal requesting the desired torque level for proper traction control system operation (CKT 463). The PCM then provides a delivered torque PWM signal (CKT 464) informing the EBTCM how much actual torque is produced by the engine.


Conditions for Setting the DTC
DTC C1323 will set when there is a malfunction in the delivered torque circuit (CKT 464) or if the signal is out of range.


Action Taken When the DTC Sets
A malfunction DTC is stored, and at the end of the current TCS cycle the TCS is disabled, TCS motors are rehomed and the amber TCS warning indicator is turned on.

Conditions for Clearing DTC
Condition for DTC is no longer present and the scan tool (CLEAR DTCs) function is used, or 100 drive cycles have passed with no DTCs detected.


Diagnostic Aids
An intermittent malfunction may be caused by a poor connection, rubbed4hrough 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 scan tool, as described in the Scan Tool manual.

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.