General System Description

The Mitsubishi ECI-MULTI (electronically controlled injection-multipoint) system is designed to maintain emission levels and fuel economy to standards set by government agencies, while providing acceptable driveability performance. The system consists of a control unit, control relay, wiring, sensors and actuators.
The ECU consists of an 8-bit microprocessor, random access memory (RAM), read only memory (ROM) and Input/Output (I/0) interface. The control relay supplies the positive circuit to the EGR and purge solenoids, ECU and injectors. It also supplies the positive circuit to the fuel pump during starting.
The system is also able to perform self-diagnostic procedures and provide back-up functions if certain circuits fail.

SENSORS/INPUTS
- A/C control units
- Air flow sensor (AFS)
- Barometric pressure sensor
- Battery voltage
- Crank angle sensor
- Detonation "knock" sensor
- EGR temperature sensor (Ca. only)
- Electrical load switch
- Engine coolant temperature sensor
- Engine coolant temperature switch (A/C)
- Idle position switch
- Ignition switch
- Ignition timing adjustment connector
- Induction control valve position sensor
- Inhibitor switch (A/T only)
- Intake air temperature sensor
- Oxygen sensor
- Power steering load switch
- Transaxle control unit (A/T only)
- Throttle position sensor
- Vehicle speed sensor
- #1 cylinder top dead center (TDC) sensor


ACTUATORS/OUTPUTS
- A/C relay
- Diagnostic check connector
- EGR solenoid (Ca. only)
- Fuel injector
- Fuel pump
- Fuel pump check connector
- Idle speed control servo (ISC)
- Induction control valve
- Malfunction indicator light
- Power transistor
- Purge control solenoid
- Transaxle control unit (A/T only)