LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 785 (Automatic Transmission) >> DTC Batt/Fluid Temp Sen (A/T Fluid Temp Sensor Circuit And TCM Power Source) >> Diagnostic Procedure

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. 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 9.
    2. NG: GO TO 2.
    Fig 1: Checking Input Signal Of A/T Fluid Temperature Sensor (With Consult-II)
    G02160899Courtesy of NISSAN MOTOR CO., U.S.A.
  2. DETECT MALFUNCTIONING ITEM 

    Check the following items:

    • Harness for short 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 9.
    2. NG: Repair or replace damaged parts.
  3. CHECK TCM POWER SOURCE STEP 1 
    1. Turn ignition switch to ON position.

      (Do not start engine.)

    2. Check voltage between TCM harness connector terminals 10 (R/Y), 19 (R/Y), 28 (Y/R) and ground.

      Voltage : Battery voltage 

    OK or NG 

    1. OK: GO TO 4.
    2. NG: GO TO  5.
    Fig 2: Checking Voltage Between TCM Harness Connector Terminals 10 (R/Y), 19 (R/Y), 28 (Y/R) And Ground
    G02160900Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK TCM POWER SOURCE STEP 2 
    1. Turn ignition switch to OFF position.
    2. Check voltage between TCM harness connector terminal 28 (Y/R) and ground.

      Voltage : Battery voltage 

    OK or NG 

    1. OK: GO TO  6.
    2. NG: GO TO 5.
    Fig 3: Checking Voltage Between TCM Harness Connector Terminal 28 (Y/R) And Ground
    G02160901Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING ITEM 

    Check the following items:

    • harness for short or open between ignition switch and TCM (Main harness)
    • Ignition switch and fuse

      Refer to "POWER SUPPLY ROUTING CIRCUIT ".

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair or replace damaged parts.
  6. 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 assembly F30 terminals 6 and 7 (component side) when A/T is cold.
      Fig 4: Temperature Resistance Chart (A/T Fluid Temperature Sensor With Terminal Cord Assembly)
      G02160902Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Reinstall any part removed.

    OK or NG 

    1. OK (without CONSULT-II) : GO TO 8.
    2. NG: GO TO 7.
    Fig 5: Checking Resistance Between Terminal Cord Assembly F30 Terminals 6 And 7
    G02160903Courtesy of NISSAN MOTOR CO., U.S.A.
  7. 7. 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.
      Fig 6: Temperature Resistance Chart A/T Fluid Temperature Sensor
      G02160904Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 7: Heating A/T Fluid Temperature Sensor In Water
      G02160905Courtesy of NISSAN MOTOR CO., U.S.A.
    • Harness of terminal cord assembly for short or open

    OK or NG 

    1. OK (without CONSULT-II) : GO TO 8.
    2. NG: Repair or replace damaged parts.
  8. 8. 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 terminal 47 and ground while warning up A/T.
      Fig 8: Temperature Voltage Chart (A/T Fluid Temperature Sensor)
      G02160906Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 9: Checking Voltage Between TCM Harness Connector Terminal 47 And Ground
      G02160907Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch to OFF position.
    4. Disconnect TCM harness connector.
    5. Check resistance between terminal 42 and ground. Refer to "WIRING DIAGRAM - AT - BA/FTS ".

      Continuity should exist. 

    OK or NG 

    1. OK: GO TO  10.
    2. NG: GO TO 9.
  9. 9. DETECT MALFUNCTIONING ITEM 

    Check the following items:

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

      Refer to GROUND CIRCUIT .

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Repair or replace damaged parts.
  10. 10. CHECK DTC 

    Perform "DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE ".

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 11.
  11. 11. 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.
scientia non olet · About LEMON Manuals