Control Unit

An 88-pin control unit is used. See CONTROL UNIT LOCATION table. The control unit uses the following input signals to determine optimum fuel injection and ignition timing: intake airflow, intake air temperature, throttle position, coolant temperature, engine speed, vehicle speed, crankshaft position, knock sensors and exhaust gas oxygen content.

Control unit can operate engine in a "limp mode," allowing vehicle operation despite component failure. Control unit also has adaptive capabilities to compensate for component wear and other factors, such as minor air (vacuum) leaks. Once a fault is recognized, it is stored in control unit memory as a fault code. The system automatically substitutes a fixed replacement value for the incorrect value caused by a defective component or circuit.

An air/fuel ratio of 14.7:1 is maintained under most driving conditions. Maximum engine RPM is limited by the control unit by eliminating power to fuel injectors. The control unit assumes control of the following functions.

A/C Compressor Control, Acceleration Enrichment, Cold Start Control, Deceleration Fuel Cut, Fuel Injection Control, Fuel Tank Vent (Evaporation) Control, Idle Speed Control, Ignition Timing Control and Anti-Knock Function, Ignition Timing/Fuel Injection Intervention Via DWA and On-Board Computer, Oxygen (Sensor) Control, Relay Controls and Self-Diagnostics.

CONTROL UNIT LOCATION

Application	Location
All Models	Inside Box On Right Rear Corner Of Engine Compartment

NOTE: Components are grouped into 2 categories. The first category covers INPUT DEVICES, which control or produce voltage signals monitored by control unit. The second category covers OUTPUT SIGNALS , which are components controlled by the control unit.