Electronic Control Unit (Ecu)

The ECU consists of a microcomputer, inspection lights, a diagnostic mode selector (or on/off switch), connectors and wiring for voltage signal input, voltage signal output and power supply. See Figure . The unit is not serviceable and should not be opened. Monitor lights are provided on side of unit so system operation can be checked. The control unit contains memory and logic circuits that enable it to interpret sensor inputs and control various engine systems. The ECU is located under the passenger seat.

For ease of understanding, components will be grouped into 2 categories. The first being ENGINE SENSORS  , components with voltage signals that are inputted into the ECU. The second being ENGINE CONTROLS  , components that are controlled with voltage signals that are outputted from the ECU.