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 Infiniti M30FACTORY OEM SERVICE PROCEDURE
Crank Angle Sensor
- Remove crank angle sensor from engine. Do not disconnect crank angle sensor harness connector. Turn ignition switch on, engine off.
- Connect negative voltmeter lead to ground. Rotate crank angle sensor shaft slowly by hand. Connect positive voltmeter lead to crank angle sensor connector terminal No. 3 (120-degree signal), voltage should fluctuate between 0-5 volts. Move voltmeter positive lead to terminal No. 4 (1-degree signal), voltage should also fluctuate between 0-5 volts. See Fig 1 .
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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