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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 777 (Automatic Transaxle Re4F03B) >> Trouble Diagnoses For Symptoms >> 21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK PNP SWITCH CIRCUIT (WITH CONSULT-II) 
    1. Turn ignition switch to ON position.

      (Do not start engine.)

    2. Select TCM INPUT SIGNALS in DATA MONITOR mode for A/T with CONSULT-II.
    3. Read out PN , R , D , 2 and 1 position switches moving selector lever to each position.
      Fig 1: Checking PNP Switch Circuit (With CONSULT-II)
      G02015950Courtesy of NISSAN MOTOR CO., U.S.A.

    Check that the signal of the selector lever position is indicated properly.

    OK or NG 

    1. OK: GO TO  3.
    2. NG: Check the following items:
      • PNP switch (Refer to PNP SWITCH .)
      • Harness for short or open between ignition switch and PNP switch (Main harness)
      • Harness for short or open between PNP switch and TCM (Main harness)

  2. CHECK PNP SWITCH CIRCUIT (WITHOUT CONSULT-II) 
    1. Turn ignition switch to ON position. (Do not start engine.)
    2. Check voltage between TCM terminals 26, 27, 34, 35, 36 and ground while moving selector lever through each position.
      Fig 2: TCM Terminals Voltage Specifications
      G02015951Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking PNP Switch Circuit (Without CONSULT-II)
      G02015952Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage 

      B: Battery voltage 

      O: 0V 

    OK or NG 

    1. OK: GO TO  4.
    2. NG: Check the following items:
      • PNP switch (Refer to PNP SWITCH .)
      • Harness for short or open between ignition switch and PNP switch (Main harness)
      • Harness for short or open between PNP switch and TCM (Main harness)

  3. CHECK OVERDRIVE CONTROL SWITCH CIRCUIT (WITH CONSULT-II) 
    1. Turn ignition switch to ON position. (Do not start engine.)
    2. Select TCM INPUT SIGNALS in DATA MONITOR mode for A/T with CONSULT-II.
    3. Read out OVERDRIVE SW.

    Check the signal of the overdrive control switch is indicated properly. (Overdrive control switch ON displayed on CONSULT-II means overdrive OFF.)

    Fig 4: Checking Overdrive Control Switch Circuit (With CONSULT-II)
    G02015953Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  5.
    2. NG: Check the following items:
      • Overdrive control switch (Refer to OVERDRIVE CONTROL SWITCH .)
      • Harness for short or open between TCM and overdrive control switch (Main harness)
      • Harness of ground circuit for overdrive control switch (Main harness) for short or open
  4. CHECK OVERDRIVE CONTROL SWITCH CIRCUIT (WITHOUT CONSULT-II) 
    1. Turn ignition switch to ON position. (Do not start engine.)
    2. Check voltage between TCM terminal 22 and ground when overdrive control switch is ON and OFF.
      Fig 5: Checking Overdrive Control Switch Circuit (Without CONSULT-II)
      G02015954Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage 

      Switch position ON: Battery voltage 

      Switch position OFF: 1V or less 

    OK or NG 

    1. OK: GO TO  6.
    2. NG: Check the following items:
      • Overdrive control switch (Refer to OVERDRIVE CONTROL SWITCH .)
      • Harness for short or open between TCM and overdrive control switch (Main harness)
      • Harness of ground circuit for overdrive control switch (Main harness) for short or open

  5. CHECK THROTTLE POSITION SWITCH CIRCUIT (WITH CONSULT-II) 
    1. Apply vacuum to the throttle opener, then check the following. Refer to TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS) .
    2. Turn ignition switch to ON position. (Do not start engine.)
    3. Select TCM INPUT SIGNALS in DATA MONITOR mode for A/T with CONSULT-II.
    4. Read out CLOSED THL/SW and W/O THRL/P-SW depressing and releasing accelerator pedal. Check the signal of throttle position switch is indicated properly.

      Data monitor 

      Accelerator pedal position 

      CLOSED THL/SW W/O THRL/P-SW 

      Released ON OFF 

      Fully depressed OFF ON 

      Fig 6: Checking Throttle Position Switch Circuit (With CONSULT-II)
      G02015955Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  7.
    2. NG: Check the following items:
      • Throttle position switch - Refer to THROTTLE POSITION SWITCH .
      • Harness for short or open between ignition switch and throttle position switch (Main harness)
      • Harness for short or open between throttle position switch and TCM (Main harness)
  6. CHECK THROTTLE POSITION SWITCH CIRCUIT (WITHOUT CONSULT-II) 
    1. Apply vacuum to the throttle opener, then check the following. Refer to TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS) .
    2. Turn ignition switch to ON position. (Do not start engine.)
    3. Check voltage between TCM terminals 16, 17 and ground while depressing, and releasing accelerator pedal slowly. (After warming up engine)
      Fig 7: TCM Terminals Voltage Specifications
      G02015956Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 8: Checking Throttle Position Switch Circuit (Without CONSULT-II)
      G02015957Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Check the following items:
      • Throttle position switch - Refer to THROTTLE POSITION SWITCH .
      • Harness for short or open between ignition switch and throttle position switch (Main harness)
      • Harness for short or open between throttle position switch and TCM (Main harness)

  7. CHECK DTC 

    Perform DIAGNOSTIC PROCEDURE 

    OK or NG 

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

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