Fifth Avenue V6-231 3.8L VIN L FI (1992)
- Injector pulse width, (switching the ground on and off twice per engine revolution).
- Idle speed, through the IAC motor.
- Ignition timing.
Note:
The PCM enters "Closed Loop" operation after the engine reaches operating temperature and the delay has elapsed.
Wide Open Throttle (WOT)
PCM MONITORS:
- Engine Temperature (ECT)
- Manifold Vacuum (MAP sensor)
- Throttle Opening (TPS)
- Battery Voltage
- Camshaft and Crankshaft Position (CMP and CKP Sensors)
PCM CONTROLS:
- De-energizes EGR system, by grounding Electronic EGR Transducer (EET) solenoid.
- Adjusts injector pulse width, to supply additional fuel.
- Monitor oxygen sensor and fine tune air/fuel ratio by varying injector pulse width
- Adjust ignition timing.
- De-energize A/C Compressor Clutch relay (if selected)
Ignition Switch Off
When the ignition switch is OFF the PCM interrupts the ground to the ASD and fuel pump relays.
Warm Idle
PCM MONITORS:
- Engine Temperature (ECT Sensor)
- Manifold Vacuum (MAP Sensor)
- Throttle Position (TPS)
- Exhaust Gas Oxygen Content (HO2S)
- A/C Switch Status
- Battery Voltage
- Camshaft and Crankshaft Position (CMP and CKP Sensors)
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)
Cruise
PCM MONITORS:
- Engine Temperature (ECT Sensor)
- Manifold Vacuum (MAP Sensor)
- Throttle Position (TPS)
- Exhaust Gas Oxygen Content (HO2S)
- A/C Switch Status
- Battery Voltage
- Camshaft and Crankshaft Position (CMP and CKP Sensors)
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
