TAC System Default Actions/Reduce Power Modes

There are 2 reduce power modes that the engine control module (ECM) can default to if an error is detected in the throttle actuator control (TAC) system. If an accelerator pedal position (APP) sensor 1 circuit fault, APP sensor 2 circuit fault, throttle position (TP) sensor 1 circuit fault, or if a TP sensor 2 circuit fault is detected with some APP angle, the ECM goes into one of the 2 reduced power modes. In this mode, the engine torque is limited so that the vehicle cannot reach speeds of more than XX km/h (XX mph). The ECM remains in this reduced power mode during the entire ignition cycle even if the fault is corrected.

If there is a condition with the TAC circuits, throttle actuator command vs actual position fault, return spring check fault, or a TP sensor 1 circuit fault, the ECM goes into the other reduced engine power mode. In this mode, the engine speed is limited to XX RPM and the fuel injectors are randomly turned OFF. At this time the Reduced Power indicator is commanded ON. The ECM remains in the reduced power mode during the entire ignition cycle even if the fault is corrected. If a TP sensor 1 or TAC circuit fault is present at the time the vehicle is at idle, with no accelerator pedal angle, the engine may stall.