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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TCM POWER SOURCE STEP   1 
    1. Turn ignition switch OFF.
    2. Disconnect A/T assembly harness connector.
    3. Check voltage between A/T assembly harness connector terminals and ground.
      A/T ASSEMBLY HARNESS CONNECTOR TERMINALS AND GROUND VOLTAGE

      Item Connector Terminal Voltage
      TCM F9 1 - Ground Battery voltage
      2 - Ground
      6 - Ground 0V

    OK or NG 

    1. OK: GO TO 2.
    2. NG: GO TO  3.
      Fig 1: Checking A/T Assembly Harness Connector Terminals And Ground Voltage
      G03607893Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK TCM POWER SOURCE STEP   2 
    1. Disconnect A/T assembly harness connector.
    2. Turn ignition switch ON. (Do not start engine.)
    3. Check voltage between A/T assembly harness connector terminals and ground.
      A/T ASSEMBLY HARNESS CONNECTOR TERMINALS AND GROUND VOLTAGE

      Item Connector Terminal Voltage
      TCM F9 1 - Ground Battery voltage
      2 - Ground
      6 - Ground

    OK or NG 

    1. OK: GO TO  4.
    2. NG: GO TO 3.
      Fig 2: Checking A/T Assembly Harness Connector Terminals And Ground Voltage
      G03607894Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING ITEM 

    Check the following.

    • Harness for short or open between battery and A/T assembly harness connector terminals 1, 2
    • Harness for short or open between ignition switch and A/T assembly harness connector terminal 6
    • 10A fuse (No. 22, located in the fuse and fusible link block) and 10A fuse (No. 49, located in the IPDM E/R)
    • Ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ".

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair or replace damaged parts.
  4. CHECK TCM GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect A/T assembly harness connector.
    3. Check continuity between A/T assembly harness connector terminals and ground.
      A/T ASSEMBLY HARNESS CONNECTOR TERMINALS AND GROUND CONTINUITY

      Item Connector Terminal Continuity
      TCM F9 5, 10 - Ground Yes

    If OK, check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
      Fig 3: Checking A/T Assembly Harness Connector Terminals And Ground Continuity
      G03607895Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING ITEM 

    Check the following.

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

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair or replace damaged parts.
  6. PERFORM SELF-DIAGNOSIS 

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

    OK or NG 

    1. OK: INSPECTION END 
    2. NG-1: Self-diagnosis does not activate: GO TO 7.
    3. NG-2: DTC is displayed: Check the malfunctioning system. Refer to "SELF-DIAGNOSTIC RESULT MODE ".
  7. CHECK TERMINAL CORD ASSEMBLY 
    1. Remove control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
    2. Disconnect A/T assembly harness connector and TCM connector.
    3. Check continuity between A/T assembly harness connector terminals and TCM connector terminals.
      A/T ASSEMBLY HARNESS CONNECTOR TERMINALS AND TCM CONNECTOR TERMINALS VOLTAGE

      Item Connector Terminal Voltage
      A/T assembly harness connector F9 1 Yes
      TCM connector F502 9
      A/T assembly harness connector F9 2 Yes
      TCM connector F502 10
      A/T assembly harness connector F9 6 Yes
      TCM connector F502 4
      Fig 4: Checking A/T Assembly Harness Connector Terminals And TCM Connector Terminals Continuity
      G03607896Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between A/T assembly harness connector terminals and TCM connector terminals.
      A/T ASSEMBLY HARNESS CONNECTOR TERMINALS AND TCM CONNECTOR TERMINALS CONTINUITY

      Item Connector Terminal Voltage
      A/T assembly harness connector F9 5 Yes
      TCM connector F504 21
      A/T assembly harness connector F9 10 Yes
      TCM connector F504 22
      Fig 5: Checking A/T Assembly Harness Connector Terminals And TCM Connector Terminals Continuity
      G03607897Courtesy of NISSAN MOTOR CO., U.S.A.
    5. If OK, check harness for short to ground and short to power.

    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: Replace open circuit or short to ground and short to power in harness or connectors.
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