dodge Workshop Repair Guides

Dodge Workshop Service and Repair Manuals

General Operation|Page 224 > < General Operation|Page 222
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PCM INPUT:

Powertrain Control Module (PCM) recognizes an abrupt increase in throttle opening, (TPS voltage increase), or drop in engine vacuum, (MAP
sensor voltage increase), as a demand for increased engine output to accelerate vehicle. 

PCM OUTPUT:

PCM increases injector pulse width to accommodate increased fuel demand.

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.

General Operation|Page 224 > < General Operation|Page 222