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Home >> Infiniti >> 2011 >> G37 IPL, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 61 (Automatic Transmission -- G37 Coupe) >> DTC/Circuit Diagnosis >> DTC P1815: M-Mode Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK MANUAL MODE SWITCH CIRCUIT

    With CONSULT-III 

    1. Turn ignition switch ON.
    2. Select "MANU MODE SW", "NON M MODE SW", "UP SW LEVER", "DOWN SW LEVER", "SFT UP ST SW"* and "SFT DWN ST SW"* in "Data Monitor" in "TRANSMISSION".
    3. Check the ON/OFF operations of each monitor item.
      CONDITION REFERENCE CHART

      Item Monitor Item Condition Status
      Manual mode switch MANU MODE SW Selector lever is shifted to manual shift gate side ON
      Other than the above OFF
      NON M-MODE SW Selector lever is shifted to manual shift gate side OFF
      Other than the above ON
      UP SW LEVER Selector lever is shifted to + side ON
      Other than the above OFF
      DOWN SW LEVER Selector lever is shifted to - side ON
      Other than the above OFF
      Paddle shifter(1) SFT UP ST SW Paddle shifter (shift-up) is pulled ON
      Other than the above OFF
      SFT DWN ST SW Paddle shifter (shift-down) is pulled ON
      Other than the above OFF
      (1) With paddle shifter

    Without CONSULT-III 

    Drive the vehicle in the manual mode, and then check that the indication of the shift position indicator matches with the actual gear position.

    1. Shift the selector lever to UP side, and then accelerate from 1GR to 7GR.
    2. Shift the selector lever to DOWN side, and then decelerate from 7GR to 1GR.
    3. *Shift the paddle shifter to UP side, and then accelerate from 1GR to 7GR.
    4. *Shift the paddle shifter to DOWN side, and then decelerate from 7GR to 1GR.

      *: With paddle shifter

      Which item is abnormal? 

      Manual mode switch: Go to 2.

      Paddle shifter: Go to  8.

  2. CHECK MANUAL MODE SWITCH CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect A/T shift selector connector.
    3. Turn ignition switch ON.
    4. Check voltage between A/T shift selector vehicle side harness connector terminals.
      VOLTAGE REFERENCE CHART

      A/T shift selector vehicle side harness connector Voltage (Approx.)
      Connector Terminal
      + -
      M137 1 4 Battery voltage
      2
      3
      5

      Is the inspection result normal? 

      YES: Go to 3.

      NO: Go to  5.

  3. CHECK MANUAL MODE SWITCH

    Check manual mode switch. Refer to "COMPONENT INSPECTION (MANUAL MODE SWITCH) ".

    Is the inspection result normal? 

    YES: Go to 4.

    NO: Repair or replace damaged parts.

  4. CHECK MALFUNCTIONING ITEM

    Check the following.

    • Check terminals of A/T shift selector harness connector and harness cladding for damage.
    • Check connector for loose connection.

      Is the inspection result normal? 

      YES: Go to  14.

      NO: Repair or replace damaged parts.

  5. CHECK GROUND CIRCUIT

    Check continuity between A/T shift selector vehicle side harness connector terminal and ground.

    CONTINUITY REFERENCE CHART

    A/T shift selector vehicle side harness connector Ground Continuity
    Connector Terminal
    M137 4 Existed

    Is the inspection result normal? 

    YES: Go to 6.

    NO: Repair or replace damaged parts.

  6. CHECK HARNESS BETWEEN A/T SHIFT SELECTOR AND UNIFIED METER AND A/C AMP. (PART 1)
    1. Turn ignition switch OFF.
    2. Disconnect unified meter and A/C amp. connector.
    3. Check continuity between A/T shift selector vehicle side harness connector terminals and unified meter and A/C amp. vehicle side harness connector terminals.
      CONTINUITY REFERENCE CHART

      A/T shift selector vehicle side harness connector Unified meter and A/C amp. vehicle side harness connector Continuity
      Connector Terminal Connector Terminal
      M137 1 M66 10 Existed
      2 25
      3 5
      5 11

      Is the inspection result normal? 

      YES: Go to 7.

      NO: Repair or replace damaged parts.

  7. CHECK HARNESS BETWEEN A/T SHIFT SELECTOR AND UNIFIED METER AND A/C AMP. (PART 2)

    Check continuity between A/T shift selector vehicle side harness connector terminals and ground.

    CONTINUITY REFERENCE CHART

    A/T shift selector vehicle side harness connector Ground Continuity
    Connector Terminal
    M137 1 Not existed
    2
    3
    5

    Is the inspection result normal? 

    YES: Go to  14.

    NO: Repair or replace damaged parts.

  8. CHECK PADDLE SHIFTER CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect paddle shifter connectors.
    3. Turn ignition switch ON.
    4. Check voltage between paddle shifter vehicle side harness connector terminals.
      VOLTAGE REFERENCE CHART

      Paddle shifter vehicle side harness connector Voltage (Approx.)
      Connector Terminal
      + -
      M32 3 1 Battery voltage
      M39

      Is the inspection result normal? 

      YES: Go to 9.

      NO: Go to  11.

  9. CHECK PADDLE SHIFTER

    Check paddle shifter. Refer to "COMPONENT INSPECTION [PADDLE SHIFTER (SHIFT-UP)] ", "COMPONENT INSPECTION [PADDLE SHIFTER (SHIFT-DOWN)] ".

    Is the inspection result normal? 

    YES: Go to 10.

    NO: Repair or replace damaged parts.

  10. CHECK MALFUNCTIONING ITEM

    Check the following.

    • Check terminals of paddle shifter connector for damage.
    • Check connector for loose connection.

      Is the inspection result normal? 

      YES: Go to  14.

      NO: Repair or replace damaged parts.

  11. CHECK GROUND CIRCUIT

    Check continuity between paddle shifter vehicle side harness connector terminals and ground.

    CONTINUITY REFERENCE CHART

    Paddle shifter vehicle side harness connector Ground Continuity
    Connector Terminal
    M32 1 Existed
    M39

    Is the inspection result normal? 

    YES: Go to 12.

    NO: Repair or replace damaged parts.

  12. CHECK HARNESS BETWEEN PADDLE SHIFTER AND UNIFIED METER AND A/C AMP. (PART 1)
    1. Turn ignition switch OFF.
    2. Disconnect unified meter and A/C amp. connector.
    3. Check continuity between paddle shifter vehicle side harness connector terminals and unified meter and A/C amp. vehicle side harness connector terminals.
      CONTINUITY REFERENCE CHART

      Paddle shifter vehicle side harness connector Unified meter and A/C amp. vehicle side harness connector Continuity
      Connector Terminal Connector Terminal
      M32 3 M66 26 Existed
      M39 6

      Is the inspection result normal? 

      YES: Go to 13.

      NO: Repair or replace damaged parts.

  13. CHECK HARNESS BETWEEN PADDLE SHIFTER AND UNIFIED METER AND A/C AMP. (PART 2)

    Check continuity between paddle shifter vehicle side harness connector terminals and ground.

    CONTINUITY REFERENCE CHART

    Paddle shifter vehicle side harness connector Ground Continuity
    Connector Terminal
    M32 3 Not existed
    M39

    Is the inspection result normal? 

    YES: Go to 14.

    NO: Repair or replace damaged parts.

  14. CHECK MALFUNCTIONING ITEM

    Check the following.

    • Check terminals of unified meter and A/C amp. connector for damage.
    • Check connector for loose connection.

      Is the inspection result normal? 

      YES: Go to 15.

      NO: Repair or replace damaged parts.

  15. CHECK UNIFIED METER AND A/C AMP.
    1. Reconnect all the connectors.
    2. Turn ignition switch ON.
    3. Select "M RANGE SW", "NM RANGE SW", "AT SFT UP SW", "AT SFT DWN SW", "ST SFT UP SW"* and "ST SFT DWN SW"* in "Data Monitor" in "METER/M&A".

      *: With paddle shifter

    4. Check the ON/OFF operations of each monitor item. Refer to "REFERENCE VALUE ".

      Is the inspection result normal? 

      YES: Go to 16.

      NO: Replace unified meter and A/C amp. Refer to "EXPLODED VIEW ".

  16. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace control valve & TCM. Refer to "EXPLODED VIEW ".

    NO: Repair or replace damaged parts.

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