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Home >> Infiniti >> 2013 >> FX37 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Automatic Transmission) >> DTC/Circuit Diagnosis >> DTC P1815: M-Mode Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK MANUAL MODE SWITCH CIRCUIT 

    With CONSULT 

    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.
      Item Monitor Item Condition Status
      Manual mode switch MANU MODE SW Manual shift gate side (neutral) ON
      Other than the above OFF
      NON M-MODE SW Manual shift gate side OFF
      Other than the above ON
      UP SW LEVER Selector lever: UP (+ side) ON
      Other than the above OFF
      DOWN SW LEVER Selector lever: DOWN (- side) ON
      Other than the above OFF
      Paddle shifter(1) SFT UP ST SW Paddle shifter: UP (+ side) ON
      Other than the above OFF
      SFT DWN ST SW Paddle shifter: DOWN (- side) ON
      Other than the above OFF
      (1) With paddle shifter

    Without CONSULT 

    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  7.

  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.
      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  4.

  3. CHECK MANUAL MODE SWITCH 
    1. Turn ignition switch OFF.
    2. Check manual mode switch. Refer to "COMPONENT INSPECTION (MANUAL MODE SWITCH) ".

      Is the inspection result normal? 

      YES: GO TO  12.

      NO: Repair or replace damaged parts.

  4. CHECK GROUND CIRCUIT (MANUAL MODE SWITCH CIRCUIT) 
    1. Turn ignition switch OFF.
    2. Check continuity between A/T shift selector vehicle side harness connector terminal and ground.
      A/T shift selector vehicle side harness connector Ground Continuity
      Connector Terminal
      M137 4 Existed

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace damaged parts.

  5. CHECK HARNESS BETWEEN A/T SHIFT SELECTOR AND UNIFIED METER AND A/C AMP. (STEP  1)
    1. Disconnect unified meter and A/C amp. connector.
    2. Check continuity between A/T shift selector vehicle side harness connector terminals and unified meter and A/C amp. vehicle side harness connector terminals.
      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 6.

      NO: Repair or replace damaged parts.

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

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

    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  12.

    NO: Repair or replace damaged parts.

  7. 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.
      Paddle shifter vehicle side harness connector Voltage (Approx.)
      Connector Terminal
      + -
      M38 3 1 Battery voltage
      M39

      Is the inspection result normal? 

      YES: GO TO 8.

      NO: GO TO  9.

  8. 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  12.

    NO: Repair or replace damaged parts.

  9. CHECK GROUND CIRCUIT (PADDLE SHIFTER CIRCUIT) 
    1. Turn ignition switch OFF.
    2. Check continuity between paddle shifter vehicle side harness connector terminal and ground.
      Paddle shifter vehicle side harness connector Ground Continuity
      Connector Terminal
      M38 1 Existed
      M39

      Is the inspection result normal? 

      YES: GO TO 10.

      NO: Repair or replace damaged parts.

  10. CHECK HARNESS BETWEEN PADDLE SHIFTER AND UNIFIED METER AND A/C AMP. (PART 1) 
    1. Disconnect unified meter and A/C amp. connector.
    2. Check continuity between paddle shifter vehicle side harness connector terminals and unified meter and A/C amp. vehicle side harness connector terminals.
      Paddle shifter vehicle side harness connector Unified meter and A/C amp. vehicle side harness connector Continuity
      Connector Terminal Connector Terminal
      M38 3 M66 6 Existed
      M39 26

      Is the inspection result normal? 

      YES: GO TO 11.

      NO: Repair or replace damaged parts.

  11. 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.

    Paddle shifter vehicle side harness connector Ground Continuity
    Connector Terminal
    M38 3 Not existed
    M39

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Repair or replace damaged parts.

  12. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Repair or replace damaged parts.

  13. 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"* on "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: Replace control valve & TCM. Refer to "EXPLODED VIEW ".

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

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