Daytona IROC R/T L4-135 2213cc 2.2L DOHC Turbo VIN A FI (1993)
Powertrain Control Module: Description and Operation
Modes of Operation
Acceleration (Except Wide Open Throttle)
NOTE: For Wide Open Throttle (WOT) operation, SEE OPEN LOOP MODES OF OPERATION.
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.
Cruise
PCM MONITORS:
- Engine Temperature (ECT Sensor)
- Manifold Vacuum (MAP Sensor)
- Charge Temperature Sensor
- Cam and Crankshaft Position (CMP and CKP Sensors)
- Throttle Position (TPS)
- Exhaust Gas Oxygen Content (O2S)
- A/C Switch Status
- Battery Voltage
- Engine Knock Sensor
PCM CONTROLS:
- Air/fuel ratio, by varying injector pulse width. Switches injector ground on and off twice per engine revolution.
- Idle speed, through the IAC motor.
- Ignition timing.
- Monitor oxygen sensor and fine tune air/fuel ratio by varying injector pulse width
- Operate A/C Compressor Clutch relay (if selected)
Deceleration
PCM MONITORS:
- Engine Temperature (ECT Sensor)
- Manifold Vacuum (MAP Sensor)
- Charge Temperature Sensor
- Cam and Crankshaft Position (CMP and CKP Sensors)
- Throttle Position (TPS)
- Exhaust Gas Oxygen Content (O2S)
- A/C Switch Status
- Battery Voltage
- Engine Knock Sensor
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:
