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Home >> Infiniti >> 2014 >> QX80 AWD >> Repair and Diagnosis >> Transmission >> Automatic Transmission >> DTC/Circuit Diagnosis >> Tow Mode System >> Diagnosis Procedure

Diagnosis Procedure

NOTE: Tow mode switch is integrated in to SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models).
  1. CHECK DTC OF TCM 

    With CONSULT 

    1. Turn ignition switch ON.
    2. Perform "Self-Diagnostic Results" in "TRANSMISSION".

      Is any DTC detected? 

      YES: Check DTC detected item. Refer to "DTC INDEX ".

      NO: GO TO 2.

  2. CHECK DTC OF COMBINATION METER 

    With CONSULT 

    Perform "Self-Diagnostic Results" in "METER/M&A".

    Is any DTC detected? 

    YES: Check DTC detected item. Refer to "DTC INDEX ".

    NO: GO TO 3.

  3. CHECK COMBINATION METER 

    With CONSULT 

    1. Select "TOW MODE IND" in "Data Monitor" in "METER/M&A".
    2. Check that "TOW MODE IND" turns ON/OFF when tow mode switch is operated.

      Is the inspection result normal? 

      YES: Replace combination meter. Refer to "EXPLODED VIEW ".

      NO: GO TO 4.

  4. CHECK TOW MODE SWITCH SIGNAL 

    With CONSULT 

    1. Select "TOW MODE SW" in "Data Monitor" in "TRANSMISSION".
    2. Check that "TOW MODE SW" turns ON/OFF when tow mode switch is operated.

      Is the inspection result normal? 

      YES: Replace combination meter. Refer to "EXPLODED VIEW ".

      NO: GO TO 5.

  5. CHECK TOW MODE SWITCH CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models).
    3. Turn ignition switch ON.
    4. Check voltage between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models) harness connector terminals.
      SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) Voltage (Approx.)
      Connector Terminal
      + -
      M54(1) M147(2) 23 20 Battery voltage
      (1) 4WD models
      (2) 2WD models

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: GO TO  9.

  6. CHECK TOW MODE SWITCH 

    Check tow mode switch. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Repair or replace damaged parts.

  7. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Repair or replace damaged parts.

  8. CHECK TOW MODE SYSTEM 
    1. Replace the control valve & TCM. Refer to "EXPLODED VIEW ".
    2. Reinstall any parts removed.
    3. Check tow mode system. Refer to "COMPONENT FUNCTION CHECK ".

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Replace combination meter. Refer to "EXPLODED VIEW ".

  9. CHECK GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models) harness connector terminal and ground.
      SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) - Continuity
      Connector Terminal
      M54(1) M147(2) 20 Ground Existed
      (1) 4WD models
      (2) 2WD models

      Is the inspection result normal? 

      YES: GO TO 10.

      NO: Repair or replace damaged parts.

  10. CHECK HARNESS BETWEEN SNOW MODE/TOW MODE/VDC OFF SWITCH ASSEMBLY (2WD MODELS) OR 4WD SWITCH ASSEMBLY (4WD MODELS) AND COMBINATION METER (PART 1) 
    1. Disconnect combination meter connector.
    2. Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models) harness connector terminal and combination meter harness connector terminal.
      SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) Combination meter Continuity
      Connector Terminal Connector Terminal
      M54(1) M147(2) 23 M34 7 Existed
      (1) 4WD models
      (2) 2WD models

      Is the inspection result normal? 

      YES: GO TO 11.

      NO: Repair or replace damaged parts.

  11. CHECK HARNESS BETWEEN SNOW MODE/TOW MODE/VDC OFF SWITCH ASSEMBLY (2WD MODELS) OR 4WD SWITCH ASSEMBLY (4WD MODELS) AND COMBINATION METER (PART 2) 

    Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly connector (4WD models) harness connector terminal and ground.

    SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) - Continuity
    Connector Terminal
    M54(1) M147(2) 23 Ground Not existed
    (1) 4WD models
    (2) 2WD models

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Repair or replace damaged parts.

  12. CHECK COMBINATION METER 
    1. Reconnect all the connectors.
    2. Check combination meter input/output signal. Refer to "REFERENCE VALUE ".

      Is the inspection result normal? 

      YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

      NO: Replace combination meter. Refer to "EXPLODED VIEW ".

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