Deceleration Mode

Indicates that the PCM has detected conditions appropriate to operate in Deceleration Fuel Mode. The PCM will command deceleration fuel mode when a sudden decrease in throttle position has been detected while the vehicle is traveling over 25 mph. While in Deceleration Fuel Mode, the PCM will decrease the amount of fuel delivered by entering Open Loop and decreasing the injector pulse width. Extended high speed closed throttle coastdown (reduce emissions and increases engine braking).