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.
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HOMESERVICE MANUALSNISSAN-DATSUN1991MAXIMA SE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL CONTROL SYSTEMFEEDBACK SYSTEM
1991 Nissan-Datsun Maxima SE, Automatic
Feedback System
1991 Nissan-Datsun Maxima SE, AutomaticSECTION Feedback System
- Start engine and warm to operating temperature. Ensure idle speed and timing are adjusted to specification. Monitor Green LED on ECU while increasing engine speed to about 2000 RPM for 2 minutes under no-load condition.
- Number of flashes during a 10-second period should flash at least 5 times. Race engine 2 or 3 times and allow to idle. Enter self-diagnostic Mode II. Monitor Green LED and Red LED on ECU while increasing engine speed to 2000 RPM for 10 seconds under no-load condition.
- LED's should flash more than 5 times simultaneously during the 10-second period. If LED's do not respond as described, check idle mixture. See IDLE SPEED & MIXTURE in ADJUSTMENTS article in the ENGINE PERFORMANCE Section.
ECU GREEN LED FEEDBACK RESPONSE
| Application | (1) Flashes (@ 2000 RPM) | ||
|---|---|---|---|
| Maxima | 5 | ||
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RENDER: 1.0x
NO RELATED
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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.