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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Altima. 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)] 

      1. :Approximately 1.5V 0.5V 

    OK or NG 

    1. OK: GO TO  7.
    2. NG: GO TO 3.
    Fig 1: Checking Input Signal Of A/T Fluid Temperature Sensor (With Consult-II)
    G02160741Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK A/T FLUID TEMPERATURE SENSOR WITH TERMINAL CORD ASSEMBLY 
    1. Turn ignition switch to OFF position.
    2. Disconnect terminal cord assembly connector in engine compartment.
    3. Check resistance between terminal cord F30 terminals 6 and 7 (component side) when A/T is cold.
      Fig 2: Temperature Resistance Chart (A/T Fluid Temperature Sensor With Terminal Cord)
      G02160742Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking Resistance Between Terminal Cord F30 Terminals 6 And 7
      G02160743Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Reinstall any part removed.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: GO TO  5.
  4. DETECT MALFUNCTIONING ITEM 

    Check the following items:

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

      Refer to "POWER SUPPLY ROUTING CIRCUIT ".

    OK or NG 

    1. OK: GO TO  7.
    2. NG: Repair or replace damaged parts.
  5. DETECT MALFUNCTIONING ITEM 
    1. Remove oil pan.
    2. Check the following items:
    • A/T fluid temperature sensor

      Check resistance between two terminals while changing temperature as shown in figure.

      Fig 4: A/T Fluid Temperature Sensor Temperature Resistance Chart
      G02160744Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Heating A/T Fluid Temperature Sensor In Water
      G02160745Courtesy of NISSAN MOTOR CO., U.S.A.
    • 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 terminal 47 (G) and ground while warming up A/T.
      Fig 6: Temperature Voltage Chart
      G02160746Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 7: Checking Voltage Between TCM Terminal 47 (G) And Ground
      G02160747Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 7.
    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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