Normal Operation

The Enhanced Traction System (ETS) is designed to limit wheel slip during acceleration when one or more of the drive wheels are accelerating too rapidly and the brake switch is off. The Electronic Brake Traction Control Module (EBTCM) monitors wheel speed slip through the Antilock Brake System (ABS) wheel speed sensors then processes wheel speed sensor data and sends a desired wheel torque value to the Powertrain Control Module (PCM). This information is sent to the PCM via the serial data link. The PCM then calculates and employs control of wheel slip/wheel torque by utilizing up to three different methods:
1. By retarding ignition timing.
2. By shutting off up to three fuel injectors.
3. By up shifting the transmission thereby reducing engine torque providing stability and traction.

If the EBTCM determines that the engine torque reduction is not sufficient to minimize wheel spin, it will repeat the above sequence.

The ETS will be enabled when the ETS switch (TRAC) is in the ON position (TRAC OFF indicator not illuminated) the catalytic converter temperature is within the normal operating range and the intake air temperature is within operating range.