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.
2012 Infiniti QX56 RWDFACTORY OEM SERVICE PROCEDURE
Input/Output Signal Chart
| Sensor | Input signal to ECM | ECM function | Actuator | ||||
|---|---|---|---|---|---|---|---|
| Crankshaft position sensor | Engine speed(1) | Cooling fan speed request signal(2) | IPDM E/R ↓ Electrically-controlled cooling fan coupling |
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| Camshaft position sensor | Camshaft position | ||||||
| Engine coolant temperature sensor | Engine coolant temperature | ||||||
| Refrigerant pressure sensor | Refrigerant pressure | ||||||
| Intake air temperature sensor | Intake air temperature | ||||||
| Battery | Battery voltage | ||||||
| Combination meter | Vehicle speed signal(2) | ||||||
| BCM | A/C switch signal(2) | ||||||
| Cooling fan speed sensor | Cooling fan speed | ||||||
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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.
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