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-DATSUN1991300ZX TURBO, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL CONTROL SYSTEMFEEDBACK SYSTEM
1991 Nissan-Datsun 300ZX Turbo, Automatic
Feedback System
1991 Nissan-Datsun 300ZX Turbo, AutomaticSECTION Feedback System
- A single Red LED, located on the ECU, is used. Start engine and warm to operating temperature. Ensure idle speed and timing are adjusted to specification. Increase engine speed to about 2000 RPM for 2 minutes under no-load condition; enter self-diagnostic Mode II and monitor Red LED on ECU.
- Red LED should flash a minimum of 5 times every 10 seconds. If Red LED does not respond as described, check idle mixture (CO percentage level). See ON-VEHICLE ADJUSTMENTS article. If idle mixture adjustment does not affect LED operation, check fuel pressure regulator, airflow meter, injector(s), engine (coolant) temperature sensor or ECU.
ECU RED LED FEEDBACK RESPONSE
| Application | (1) Flashes (@ 2000 RPM) | ||
|---|---|---|---|
| 300ZX | 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.