Modes Of Operation: Deceleration

This is a CLOSED LOOP mode. During deceleration the PCM receives the following inputs:

• Engine Coolant Temperature
• Manifold Absolute Pressure
• Engine Speed
• Throttle Position
• Exhaust Gas Oxygen Content
• A/C Control Positions
• Battery Voltage

The PCM may receive a closed throttle input from the throttle position sensor (TPS) when it senses an abrupt decrease in manifold pressure. This indicates a hard deceleration. In response, the PCM reduces injector pulse width to maintain control of the air fuel mixture.