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.
1992 Nissan-Datsun 240SX SE, 2D ConvertibleFACTORY OEM SERVICE PROCEDURE
ECU Power Transistor Output Signal
- Using a logic probe or DVOM with an analog bar graph function, carefully backprobe 20-pin ECU connector terminals No. 1, 2, 3, 11, 12 and 13 while cranking engine. This tests ECU output signals that trigger power transistor unit.
- If pulse signals of about 0.1 volt are present at each specified ECU terminal, replace power transistor unit. If pulse signals are not available at any terminal, go to next step.
- While cranking engine, check for battery voltage at terminal No. 43 (start signal) of ECU connector. If battery voltage is not present during cranking, repair start signal circuit and retest.
Factory Service Tools
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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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