Envoy 4WD 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:
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Acceleration limiting-The ECM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited.
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Limited throttle mode-The ECM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited.
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Throttle default mode-The ECM will turn OFF the throttle actuator motor and the throttle will return to the spring loaded default position.
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Forced idle mode-The ECM will perform the following actions:
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Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF.
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Ignore the accelerator pedal input.
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Engine shutdown mode-The ECM will disable fuel and de-energize the throttle actuator.
