Description & Operation: Notes

The Electronic Control Unit (ECU) receives signals (data) from various sensors. The ECU processes input data and sends output signals to various control devices. This allows for precise control of air/fuel mixture and idle speed under all operating conditions.

The ECU is the main controlling device of the electronic control system. The basic injector duration is read from calibration tables built into ECU internal memory. The ECU modifies the basic injector duration according to input signals from various sensors to obtain the final injector duration. This allows the ECU to obtain optimum injector pulse.

The ECU also controls cold start system, electric fuel pump and fuel cut-off systems. The ECU contains a fail-safe system to monitor sensors and detect any abnormality in ECU itself. This provides safe driving even if one or more of the sensors are faulty or ECU malfunctions.

The ECU has a self-diagnostic capability to help diagnose problems. This system uses a dash mounted PGM-FI or Check Engine warning light and one ECU mounted self-diagnostic LED. The PGM-FI warning light will glow for 2 seconds when ignition is turned on. The ECU is mounted under carpet below passenger side dash.