2022 Infiniti QX55 EssentialFACTORY OEM SERVICE PROCEDURE

Self Diagnostic Result Mode

Self Diagnostic ItemΒ 

Regarding items of DTC and 1st trip DTC, refer to DTC Index .

How to Erase DTCΒ 

NOTE: If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.

Freeze Frame Data and 1st Trip Freeze Frame DataΒ 

Freeze frame data item* 1

Description

Mileage

The engine control component part/control system has a trouble code displayed as PXXXX. (Refer to DTC Index .)

IGN voltage

The calculated load value at the moment a malfunction is detected is displayed.

Acc sensor voltage [V]

The engine coolant temperature at the moment a malfunction is detected is displayed.

ENGINE rpm

  • "Long-term fuel trim" at the moment a malfunction is detected is displayed.
  • The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than short-term fuel trim.

Actuator current

The engine speed at the moment a malfunction is detected is displayed.

Board degC

The vehicle speed at the moment a malfunction is detected is displayed.

Error code

The throttle valve opening angle at the moment a malfunction is detected is displayed.

PWM command

The basic injection quantity at the moment a malfunction is detected is displayed.

*1: The items are the same as those of 1st trip freeze frame data.

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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