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.
1990 Nissan-Datsun Sentra BaseFACTORY OEM SERVICE PROCEDURE
Mode V
Mode detects problems when system is active. The moment a malfunction is detected, the Red LED and Green LED on the side of ECU will display the malfunction code.
- While operating the vehicle in self-diagnostic Mode V, observe the inspection lights. Operate vehicle under conditions which malfunction or intermittent seems to occur.
- If malfunction code is indicated, repair related circuit for intermittent problem. If no intermittent fault is indicated, go to INTERMITTENT SIMULATION .
Factory Service Tools
Use the Manual With the Right Hardware
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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.