California

ECU System:

PURPOSE
The Mitsubishi electronically controlled multipoint injection system (ECI-MULTI) maintains emission levels and fuel economy within government agency standards, while optimizing driveability. The system consists of an electronic control unit (ECU), control relay, wiring, sensors and actuators.

OPERATION
The ECU uses an 8-bit microprocessor, random access memory (RAM), read only memory (ROM) and an Input/Output (I/0) interface. The control relay supplies positive current to the purge solenoid, ECU, and injectors. It also supplies current to the fuel pump during starting.

The system also performs self-diagnostic procedures and provides back-up functions if certain circuits fail.

SENSORS/INPUTS
- A/C control unit
- Barometric pressure sensor
- Battery voltage
- Crankshaft Position (CKP) sensor
- EGR temperature sensor (Ca. only)
- Engine coolant temperature (ECT) sensor
- Heated Oxygen sensor (HO2S) (Ca. only)
- Idle position switch
- Ignition switch
- Ignition timing adjustment connector
- Inhibitor switch (A/T only)
- Intake air temperature sensor
- Mass Air flow sensor (AFS)
- Motor position sensor (MPS)
- Oxygen sensor (O2S) (Federal only)
- Power steering load switch
- Throttle position (TP) sensor
- Vehicle speed sensor
- Camshaft (CMP) 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)
- Malfunction indicator light
- Power transistor
- Purge control solenoid
- Diagnostic check connector