Engine Only Traction Control (EOTC) System: Notes

The Engine Only Traction Control (EOTC) system is controlled by the PCM and uses the same wheel speed sensors and tone rings that are used for the anti-lock control system. The ABS module continuously monitors the rotational speed of each wheel and sends that information to the PCM over the HS-CAN  bus. When the PCM detects a wheel spinning excessively, it will assist with traction control by adjusting engine timing and decreasing fuel injector pulses. The PCM will also send a message to the IC  indicating that a traction event is taking place, when the IC  receives this message it will flash the stability/traction control indicator "sliding-car icon". Once the affected wheel returns to normal speed, the PCM returns engine timing and fuel injectors to normal operation and sends another message to the IC  indicating that the traction event has ended and the IC  extinguishes the stability/traction control indicator.

If wheel speed sensor DTCs are present in the ABS module or communication DTCs are present in the IC  , PCM or ABS module, the EOTC  system will also be disabled. When the system is disabled due to DTCs being present, both the ABS warning indicator and the stability/traction control indicator will be illuminated.