Electronic Control Unit (Ecu) Operation

The ECU consists of a microcomputer, inspection lights, a diagnostic mode selector (or on/off switch), connectors and wiring or signal input, 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. On Maxima, Pulsar, Sentra, Stanza and Van models, ECU is located under the passenger seat. On Stanza Wagon models, the ECU is located under the drivers seat. On 200SX models, the ECU is located behind the left kick panel. On 300ZX models, ECU is located behind the right kick panel.