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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECTION START 

    Do you have CONSULT-II?

    Yes or No 

    1. Yes: GO TO 2.
    2. No: GO TO  6.
  2. CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (WITH CONSULT-II) 

    With CONSULT-II 

    1. Start engine.
    2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
    3. Read out the value of "FLUID TEMP SE".

      Voltage: 

      Cold [20°C (68°F)] -> Hot [80°C (176°F)]: 

      Approximately 1.5V -> 0.5V 

      Fig 1: Checking Input Signal Of A/T Fluid Temperature Sensor (With CONSULT-II)
      G02032836Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

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

    Check the following item: 

    • Harness for short to ground or short to power or open between TCM, ECM and terminal cord assembly (Main harness)
    • Ground circuit for ECM.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair or replace damaged parts.
  4. CHECK A/T FLUID TEMPERATURE SENSOR WITH TERMINAL CORD ASSEMBLY 
    1. Turn ignition switch to "OFF" position.
    2. Disconnect terminal cord assembly connector on the right side of transfer assembly.
    3. Check resistance between terminals 8 and 9 when A/T is cold [20°C (68°F)].
      Fig 2: Checking Resistance Between Terminals 8 And 9
      G02032837Courtesy of NISSAN MOTOR CO., U.S.A.

    Is resistance approx. 2.5 kΩ? 

    1. Yes: GO TO  7.
    2. No: GO TO 5.
  5. DETECT MALFUNCTIONING ITEM 
    1. Remove oil pan.
    2. Check the following items:
      • A/T fluid temperature sensor

        Refer to "Component Inspection ".

      • Harness of terminal cord assembly for short or open

    OK or NG 

    1. OK: GO TO  7.
    2. NG: Repair or replace damaged parts.
  6. CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (WITHOUT CONSULT-II) 

    Without CONSULT-II 

    1. Start engine.
    2. Check voltage between TCM harness connector M120 terminal 47 and ground while warming up A/T.

      Voltage: 

      Cold [20°C (68°F)] -> Hot [80°C (176°F)]: 

      Approximately 1.5V -> 0.5V 

      Fig 3: Checking Voltage Between TCM Harness Connector M120 Terminal 47 And Ground
      G02032838Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  4.
    2. NG: GO TO  3.
  7. CHECK DTC 

    Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE , .

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 8.
  8. CHECK TCM INSPECTION 
    1. Perform TCM input/output signal inspection.
    2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: Repair or replace damaged parts.
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