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.
2013 Infiniti M56 BaseFACTORY OEM SERVICE PROCEDURE
Input/Output Signal Chart
| Sensor | Input signal to ECM | ECM function | Actuator | ||||
|---|---|---|---|---|---|---|---|
| Crankshaft position sensor | Engine speed(2) | Fuel injection & mixture ratio control | Fuel injector | ||||
| Camshaft position sensor | Camshaft position | ||||||
| Mass air flow sensor | Amount of intake air | ||||||
| Intake air temperature sensor | Intake air temperature | ||||||
| Engine coolant temperature sensor | Engine coolant temperature | ||||||
| Air fuel ratio (A/F) sensor 1 | Density of oxygen in exhaust gas | ||||||
| Fuel rail pressure sensor | Fuel rail pressure | ||||||
| Throttle position sensor | Throttle position | ||||||
| Accelerator pedal position sensor | Accelerator pedal position | ||||||
| TCM | Park/neutral position | ||||||
| Battery | Battery voltage(2) | ||||||
| Knock sensor | Engine knocking condition | ||||||
| Power steering pressure sensor | Power steering operation | ||||||
| Heated oxygen sensor 2(1) | Density of oxygen in exhaust gas | ||||||
| ABS actuator and electric unit (control unit) | VDC/TCS operation command | ||||||
| A/C auto amp. | A/C ON signal Blower ON signal | ||||||
| Combination meter | Vehicle speed | ||||||
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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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