Envoy 2WD V8-5.3L VIN M (2005)
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.