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 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
Crank Angle & Sub-Crank Angle Sensor Signal
- Remove crank angle sensor from engine. DO NOT disconnect crank angle sensor harness connector. Turn ignition 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. 1 (90-degree signal). Voltage should fluctuate between 0 and 5 volts. Move voltmeter positive lead to terminal No. 2 (one-degree signal). Voltage should again fluctuate between 0 and 5 volts. See Fig 1 .
- Set voltmeter to 100-mV AC scale. Connect positive voltmeter lead to terminal "a" and negative voltmeter lead to terminal "b" of sub-crank angle sensor terminal connector. See Fig 1 . Rotate crank angle sensor shaft slowly by hand; voltmeter should deflect. If voltmeter does not deflect, replace crank angle sensor.
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.