Traction Control System

The traction control system uses the ABS module and the PCM to limit wheel spin. When the ABS module detects a wheel spinning excessively, brake pressure to the appropriate brake caliper is modulated. This is accomplished by opening and closing the appropriate solenoid valves inside the HCU  while the hydraulic pump motor is activated. At the same time, the ABS module sends a message over the HS-CAN  bus that a traction control event is taking place. When the PCM receives this message, it adjusts engine timing and decrease fuel injector pulses. When the IC  receives this message, it flashes the sliding-car icon (twice per second). Once the affected wheel returns to normal speed, the ABS module returns the solenoid valves in the HCU  to their normal position, deactivates the hydraulic pump motor and sends another message over the HS-CAN  bus indicating that the traction event has ended. The PCM returns engine timing and fuel injectors to normal operation and the IC  extinguishes the sliding-car icon.

Once vehicle speed reaches or exceeds 100 km/h (62 mph), traction control is accomplished only through the PCM.

If the anti-lock control system is disabled due to DTCs being present in the ABS module, the traction control system is also disabled. When the traction control system is disabled due to DTCs being present, both the ABS warning indicator and the sliding-car icon is illuminated.