Reduced Engine Power Mode

When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:

• Acceleration limiting-The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode-The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode-The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode-The ECM will perform the following actions:
  • Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned off.
  • Ignore the accelerator pedal input.
• Engine shutdown mode-The ECM will disable fuel and de-energize the throttle actuator.