System Description

Computerized Engine Controls (EFC System):

PURPOSE
The vehicle ECU and sensor and output systems control virtually all aspects of engine operation. This combined control allows the engine to function at optimum performance while maintaining exceptable emission and fuel economy levels.

OPERATION
During normal vehicle operation, the ECU controls fuel, spark and emission systems. The system uses the following inputs and outputs to control engine performance and reduce emissions:

INPUTS OUTPUTS
Engine rpm Radiator fan
Engine temperature Vacuum line control solenoid
Manifold vacuum A/C compressor
Atmospheric pressure Duty solenoid valve
A/C request EGR solenoid
Radiator fan Cansiter purge control solenoid
Vehicle speed Float chamber vent control solenoid
Clutch switch (FWD M/T) Fuel pump relay
Crank angle sensor Auto choke relay
EGR temperature sensor Ignitor / Power transistor
Key on Idle-up solenoid
Starter on High altitude compensator solenoid
Lighting system Upshift indiactor light (M/T)
Torque signal (A/T)