2022 Infiniti QX55 EssentialFACTORY OEM SERVICE PROCEDURE

System Diagram

GNSILL0182238Courtesy of NISSAN NORTH AMERICA, INC.

Component parts

Function

Crankshaft position sensor

Crankshaft Position SensorΒ 

Exhaust Camshaft Position Sensor

Exhaust Camshaft Position SensorΒ 

Engine coolant temperature sensor 1

Engine Coolant Temperature SensorΒ 

Accelerator Pedal Position Sensor

Accelerator Pedal Position SensorΒ 

Battery

ECM receives the battery voltage signal.

Refrigerant pressure sensor

Refrigerant Pressure SensorΒ 

EPS control unit

ECM receives the EPS operation signal via CAN communication.

Combination meter

ECM receives the vehicle speed signal via CAN communication.

A/C auto amp.

ECM receives the signal via CAN communication.

  • A/C ON signal
  • A/C evaporator temperature
  • Target A/C evaporator temperature
  • Blower fan ON signal

ECM

ECMΒ 

IPDM E/R

ECM transmits the cooling fan control signal via CAN communication.

Cooling fan control module

Cooling FanΒ 

Cooling fan motor

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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