LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0500 To P1424 >> DTC P0850: PNP Switch >> DTC Logic >> DTC Confirmation Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Confirmation Procedure

  1. INSPECTION START

    Will CONSULT be used?

    Will CONSULT be used? 

    YES: GO TO 2.

    NO: GO TO  5.

  2. PRECONDITIONING
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON.
    3. Turn ignition switch OFF and wait at least 10 seconds.

    : GO TO 3.

  3. CHECK PNP SIGNAL

    WITH CONSULT

    1. Turn ignition switch ON.
    2. Select "P/N POSI SW" in "DATA MONITOR" mode with CONSULT. Then check the "P/N POSI SW" signal under the following conditions.
    Position (Selector lever) Known-good signal
    N or P position ON
    Except above position OFF

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Go to "DIAGNOSIS PROCEDURE ".

  4. PERFORM DTC CONFIRMATION PROCEDURE
    1. Select "DATA MONITOR" mode with CONSULT.
    2. Start engine and warm it up to normal operating temperature.
    3. Maintain the following conditions for at least 50 consecutive seconds.
      CAUTION: Always drive vehicle at a safe speed.
      ENG SPEED 1, 300 - 6, 375 rpm
      COOLAN TEMP/S More than 70°C (158°F)
      B/FUEL SCHDL 2.0 - 31.8 msec
      VHCL SPEED SE More than 64 km/h (40 mph)
      Selector lever Suitable position
    4. Check 1st trip DTC.

    Is 1st trip DTC detected? 

    YES: Go to "DIAGNOSIS PROCEDURE ".

    NO: INSPECTION END

  5. PERFORM COMPONENT FUNCTION CHECK

    WITH GST

    Perform Component Function Check. Refer to "COMPONENT FUNCTION CHECK ".

    NOTE: Use Component Function Check to check the overall function of the park/neutral position (PNP) signal circuit.
    During this check, a 1st trip DTC might not be confirmed.

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Go to "DIAGNOSIS PROCEDURE ".