General System Description

PURPOSE
The 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 module (ECM), control relay, wiring, sensors and actuators.

OPERATION
The ECM 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, ECM, 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 units
- Air flow sensor (AFS)
- Anti-lock brake signal
- Barometric pressure sensor
- Battery voltage
- Crankshaft Position 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
- Inhibitor switch (A/T only)
- Intake air temperature sensor
- Muffler mode change over switch
- 4 Oxygen sensors
- Power steering load switch
- Transaxle control unit (A/T only)
- Throttle position sensor
- Vehicle speed sensor
- Camshaft Position sensor

ACTUATORS/OUTPUTS
- Active exhaust control unit
- A/C relay
- Boost meter
- Diagnostic check connector
- EGR solenoid
- Fuel injector
- Fuel pressure control valve
- Fuel pump
- Fuel pump check connector
- Idle speed control servo (ISC)
- Malfunction indicator light
- Power transistor
- Purge control solenoid
- Transaxle control unit (A/T only)
- Wastegate control solenoid