Deceleration

PCM MONITORS:
^ Engine Temperature (ECT Sensor)
^ Manifold Vacuum (MAP Sensor)
^ Engine RPM (distributor pick-up)
^ Throttle Position (TPS)
^ Exhaust Gas Oxygen Content (HO2S)
^ A/C Switch Status
^ Battery Voltage

UNDER NORMAL DECELERATION, PCM:
Continues normal (reduced) injection.

De-energizes EGR system, by grounding Electronic EGR Transducer (EET) solenoid.

UNDER HARD DECELERATION, (CLOSED THROTTLE AND ABRUPT INCREASE IN MANIFOLD VACUUM) THE PCM:
Ignores oxygen sensor input, and initiates fuel cut-off strategy, firing injector only once per engine revolution.

Disables EGR system, by grounding EGR solenoid.

Disables EVAP purge system, by grounding EVAP solenoid.