Torque Managment

Traction control is simultaneously controlled by the PCM in the event that applying the brakes does not provide necessary traction. The PCM receives a torque request via a Pulse Width Modulated (PWM) signal from the EBTCM/EBCM requesting the desired torque level for proper traction control system operation. Torque reduction will be indicated if the duty cycle of the PWM signal is between 10% (100% torque reduction) and 90% (no torque reduction) and at least one (up to five) cylinder is requested to be disabled (the outside limits are used for diagnostic purposes and open or shorted PWM circuit). The percent duty cycle will indicate the percent torque required. The PCM will selectively disable fuel to certain cylinders to achieve this reduction. The timing of this action will be controlled by the EBTCM/EBCM with the following constraints:
1. The PCM will not allow traction control fuel shutoff if: engine coolant temperature is less than -40°C, greater than or equal to 131°C or low coolant level is detected.
2. Cylinders will be disabled under the following circumstance: engine speed is greater than or equal to 600 RPM.