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Home >> Infiniti >> 2006 >> Q45 >> Repair and Diagnosis >> Transmission >> Automatic Transmission >> DTC P1815 Manual Mode Switch >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK CAN COMMUNICATION LINE 

    Perform the self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

    Is a malfunction in the CAN communication indicated in the results? 

    1. YES : Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE ".
    2. NO : GO TO 2.
  2. CHECK MANUAL MODE SWITCH CIRCUIT 

    With CONSULT-II 

    1. Turn ignition switch ON. (Do not start engine.)
    2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
    3. Read out ON/OFF switching action of "MANU MODE SW", "NON M-MODE SW", "UP SW LEVER", "DOWN SW LEVER".
      CONSULT-II REFERENCE VALUE CHART

      Item name Condition Display Value
      MANU MODE SW Manual shift gate position (neutral) ON
      Other than the above OFF
      NON M-MODE SW Manual shift gate position OFF
      Other than the above ON
      UP SW LEVER Selector lever: +side ON
      Other than the above OFF
      DOWN SW LEVER Selector lever: -side ON
      Other than the above OFF
      Fig 1: Identifying CONSULT-II Data Monitor Display
      G04128086Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    Drive vehicle in the manual mode, and confirm that the actual gear position and the meter's indication of the position mutually coincide when the selector lever is shifted to the "+ (up)" or "- (down)" side (1st <==> 5th gear).

    OK or NG 

    1. OK : GO TO  4.
    2. NG : GO TO 3.
  3. DETECT MALFUNCTIONING ITEM 

    Check the following.

    • Manual mode switch. Refer to "COMPONENT INSPECTION ".
    • Pin terminals for damage or loose connection with harness connector.
    • Open circuit or short to ground or short to power in harness or connector for A/T device (manual mode switch).
    • Combination meters. Refer to "TROUBLE DIAGNOSIS ".

    OK or NG 

    1. OK : GO TO 4.
    2. NG : Repair or replace damaged parts.
  4. CHECK DTC 

    Perform "DTC Confirmation Procedure". Refer to "DTC CONFIRMATION PROCEDURE ".

    OK or NG 

    1. OK : INSPECTION END 
    2. NG : GO TO 5.
  5. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT 

    Check TCM power supply and ground circuit. Refer to "MAIN POWER SUPPLY AND GROUND CIRCUIT ".

    OK or NG 

    1. OK : GO TO 6.
    2. NG : Repair or replace damaged parts.
  6. DETECT MALFUNCTIONING ITEM 

    Check the following.

    • The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.

    OK or NG 

    1. OK : Replace the control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
    2. NG : Repair or replace damaged parts.
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