Fuel Injected

The computerized control system used on fuel injected models is either EEC or EEC-IV. The computers of the EEC and EEC-IV systems is a microprocessor called the Electronic Control Assembly (ECA). The computer monitors engine operating conditions by input received from engine switches and sensors. Control of output actuators determines fuel mixture and idle speed. On EEC models equipped with turbochargers (Probe Turbo), the ECA also controls the ignition output signal.

The engine control system consists of the ECA, sensors, switches, and actuators. The ECA sends out electrical reference signals to engine sensors and then analyzes the return signals. The engine sensors supply the ECA with specific information, in the form of electrical signals, to determine engine operating conditions. In the event of a sensor or actuator failure, the ECA initiates an alternative strategy to allow the vehicle to maintain driveability. This strategy is called Failure Mode Effects Management (FMEM).

The "Check Engine" light will remain on whenever FMEM is in operation. FMEM substitutes a fixed sensor signal and continues to monitor the failed sensor. If the signals from a faulty sensor return to within operating limits, the ECA will resume using the sensor's signal.