Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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