Limp-In Mode

The ECM utilizes different degrees of engine limp-in. The ECM is able to limit engine rpm, engine power output (turbo boost reduction), activate engine cooling fan or all of these functions based on the type of fault that is detected. Critical engine performance faults such as accelerator pedal position sensor fault will result in a fixed idle speed of approximately 680 rpm regardless of actual pedal position. Other less critical faults will result in power reduction throughout the full range of driving conditions.