Test P: The Traction Control System Cannot Be Disabled/Enabled or The Traction Control System Is Inoperative

Pinpoint Test P: The Traction Control System Cannot Be Disabled/Enabled or the Traction Control System is Inoperative
Refer to Vehicle/Diagrams, Vehicle Dynamic Systems for schematic and connector information.

Normal Operation
The standard ABS module with engine only traction control (EOTC) sends wheel speed sensor information to the PCM along the high-speed controller area network (HS-CAN) bus. The PCM compares the front wheel speed sensor information to the rear wheel speed sensor information to determine if traction control is necessary. If traction control is necessary, the PCM limits engine torque by regulating fuel and spark to the cylinders, to control the wheel slip. At the same time, the PCM sends the instrument cluster a message over the HS-CAN bus to flash the traction control indicator. The traction control indicator informs the driver that a traction control event is taking place.

The ABS module with traction control and roll stability control (RSC) sends monitors the wheel speed sensor information to determine if traction control is necessary. If traction control is necessary, the ABS module sends a request to the PCM along the HS-CAN bus which limits engine torque by regulating fuel and spark to the cylinders. At the same time, the ABS module sends the instrument cluster a message over the HS-CAN bus to flash the traction control indicator. The traction control indicator informs the driver that a traction control event is taking place.

The traction control system can be disabled by pressing the traction control switch located on the instrument panel. When the system is disabled, the traction control OFF indicator on the switch will illuminate and the message center (if equipped) will display Traction Control Off.

Fused battery voltage to disable the system and to illuminate the traction control OFF indicator is supplied to the traction control switch from central junction box (CJB) fuse 22 (15A) along circuit 729 (RD/WH). When the traction control switch is pressed, the voltage is supplied through the switch to the instrument cluster along circuit 959 (GY). The instrument cluster then grounds circuit 960 (BK/LB) which illuminates the traction control OFF indicator in the switch.

DTC C1093 Traction Control Disable Switch Circuit Failure - If during normal operation the instrument cluster detects voltage on circuit 959 (GY) for more than 2 minutes or if the instrument cluster detects voltage on 959 (GY) at all during the on-demand self test, DTC C1093 will be set.

This pinpoint test is intended to diagnose the following:
^ Fuse
^ PCM configuration
^ Instrument cluster configuration
^ Wiring, terminals or connectors
^ Traction control switch
^ HS-CAN bus
^ PCM

P1-P2:

P3-P6:

P6 (Continued)-P8:

P9: