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Home >> Infiniti >> 2023 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (Diagnostics) (1 Of 2) >> Description >> Diagnosis System (ECM) >> Consult Function >> Diagnosis Description >> Self Diagnostic Result Mode
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Self Diagnostic Result Mode

Self Diagnostic Item 

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

How to Read DTC and 1st Trip DTC 

DTCs and 1st trip DTCs related to the malfunction are displayed in "Self-diag results".

How to Erase DTC and 1st Trip DTC 

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.
  • If the DTC is not for A/T related items (Refer to DTC Index .), skip step 1.
  1. Erase DTC in TCM. Refer to Diagnosis Description .
  2. Select "ENGINE" with CONSULT.
  3. Select "SELF-DIAG RESULTS".
  4. Touch "ERASE". (DTC in ECM will be erased.)

Freeze Frame Data and 1st Trip Freeze Frame Data 

Freeze frame data item*

Description

DIAG TROUBLE CODE

[PXXXX]

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

CAL/LD VALUE [%]

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

COOLANT TEMP [ deg.C] or [ deg.F]

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

L-FUEL TRM-B1 [%]

  • "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.

L-FUEL TRM-B2 [%]

S-FUEL TRM-B1 [%]

  • "Short-term fuel trim" at the moment a malfunction is detected is displayed.
  • The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel schedule.

S-FUEL TRM-B2 [%]

ENGINE SPEED [rpm]

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

VEHICLE SPEED

[km/h] or [mph]

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

INT MANI PRES [kPa]

  • These items are displayed but are not applicable to this model.

ABSOL TH.P/S [%]

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

B/FUEL SCHDL [msec]

  • The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE [ deg.C] or [ deg.F]

  • The intake air temperature at the moment a malfunction is detected is displayed.

FUEL SYS-B1

  • "Fuel injection system status" at the moment a malfunction is detected is displayed.
  • One of the following mode is displayed.

    Mode 2 Open loop due to detected system malfunction

    Mode 3 Open loop due to driving conditions (power enrichment, deceleration enleanment)

    Mode 4 Closed loop - using oxygen sensor (s) as feedback for fuel control

    Mode 5 Open loop - has not yet satisfied condition to go to closed loop

FUEL SYS-B2

COMBUST CONDITION

  • These items are displayed but are not applicable to this model.

FUEL RAIL PRESSURE [MPa]

  • The fuel rail pressure at the moment a malfunction is detected is displayed.

TARGET FUEL RAIL PRESSURE [MPa]

  • The target fuel rail pressure at the moment a malfunction is detected is displayed.

BATTERY VOLTAGE [V]

  • The battery voltage at the moment a malfunction is detected is displayed.

FUEL LEVEL [%]

  • The fuel level at the moment a malfunction is detected is displayed.

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