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.
1993 Nissan-Datsun Maxima SE, Standard, RS5F50VFACTORY OEM SERVICE PROCEDURE
Start Signal System Test (240SX)
- Locate ECM harness connector. ECM is located behind passenger side kick panel. Measure voltage between ground and ECM harness connector terminal No. 34 (Orange wire). See Figure and Figure . Turn ignition switch to START position. Battery voltage should be present in start position ONLY. Zero volts should be present in any other ignition switch position. If voltage is not as specified, go to next step. If voltage is as specified, system is functioning properly.
- Turn ignition off. Disconnect ECM harness connector. Disconnect ignition switch harness connector. Check continuity between ECM harness connector terminal No. 34 (Orange wire) and ignition switch harness connector terminal "f" (Black/Yellow wire). For ignition switch connector identification, see Figure . Continuity should exist. If continuity exists, check ECM and ECM harness cconnector terminals for correct installation, damage or corrosion. Repair as necessary. If continuity does not exist, repair open in harness or connectors between ignition switch and ECM harness connector. Check 10-amp fuse located in fuse box under left instrument panel. Repair or replace as necessary.
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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