PCM Interaction With Traction Control

The PCM is the "master" of the traction control system receiving inputs on TC switch and wheel speed status from the ABS controller. The PCM looks at this data then verifies no codes are present and commands the ABS controller to turn On the traction LED, indicating traction control system is enabled. The PCM will disable the traction control system under the following conditions:
- The driver presses the TC switch, requesting Off.
- The ABS controller has indicated wheel speed sensor problems to the PCM.
- No serial data communication between the PCM and ABS controller.
- Certain PCM codes are set.