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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 785 (Automatic Transmission) >> Trouble Diagnosis For Symptoms >> 21. TCM Self-diagnosis Does Not Activate (PNP & 3 Position Switches Circuit Checks), and Throttle Position Sensor [Accelerator Pedal Position (APP) Sensor] Circuit Check >> 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.
NOTE: The diagnostic procedure includes inspection for the 3 position switch circuit.
  1. CHECK PARK/NEUTRAL POSITION (PNP) SWITCH CIRCUIT (WITH CONSULT-II) 

    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 P/N, R, D, 2 and 1 position switches moving selector lever to each position. Check that the signal of the selector lever position is indicated properly.

    OK or NG 

    1. OK: GO TO  5.
    2. NG: GO TO 2.
    Fig 1: Checking Park/Neutral Position (PNP) Switch Circuit (With Consult II)
    G02160987Courtesy of NISSAN MOTOR CO., U.S.A.
  2. DETECT MALFUNCTIONING ITEM 

    Check the following items:

    • Park/neutral position (PNP) switch
    • Check continuity between park/neutral position (PNP) switch F29 terminals 1 (G/R) and 2 (B) and between terminals 3 (G/Y) and 4 (PU/W), 5 (P/B), 6 (G), 7 (BR), 8 (G/W) and 9 (GY/R) while moving manual shaft through each position.
      Fig 2: Park Neutral Position Switch Lever Position Terminal Number Chart
      G02160988Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking Continuity Between Park/Neutral Position (PNP) Switch F29 Terminals 1 (G/R) And 2 (B) And Between Terminals 3 (G/Y) And 4 (PU/W), 5 (P/B), 6 (G), 7 (BR), 8 (G/W) And 9 (GY/R)
      G02160989Courtesy of NISSAN MOTOR CO., U.S.A.
    • If NG, check again with manual control cable disconnected from manual shaft of A/T assembly. Refer to step a.
    • If OK on step b, adjust manual control cable. Refer to "CONTROL CABLE ADJUSTMENT ".
    • If NG on step b, remove park/neutral position (PNP) switch from A/T and check continuity of park/neutral position (PNP) switch terminals. Refer to step a.
    • If OK on step d, adjust park/neutral position (PNP) switch. Refer to "PARK/NEUTRAL POSITION (PNP) SWITCH ADJUSTMENT ".
    • If NG on step d, replace park/neutral position (PNP) switch.
    • Harness for short or open between ignition switch and park/neutral position (PNP) switch (Main harness)
    • Harness for short or open between park/neutral position (PNP) switch and TCM (Main harness)

    OK or NG 

    1. OK: GO TO  5.
    2. NG: Repair or replace damaged parts.
  3. CHECK PARK/NEUTRAL POSITION (PNP) SWITCH CIRCUIT (WITHOUT CONSULT-II) 

    Without CONSULT-II 

    1. Turn ignition switch to ON position. (Do not start engine.)
    2. Check voltage between TCM terminals 26 (PU/W), 27 (P/B), 34 (G), 35 (G/W), 36 (R/B) and ground while moving selector lever through each position.
      Fig 4: Park Neutral Position Switch Lever Position Terminal Number Chart
      G02160990Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Checking Park/Neutral Position (PNP) Switch And Voltage Circuit (Without Consult-II)
      G02160991Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage: 

      1. B :Battery voltage 
      2. 0 :0V 

    OK or NG 

    1. OK: GO TO  6.
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING ITEM 

    Check the following items:

    • Park/neutral position (PNP) switch
    • Check continuity between park/neutral position (PNP) switch terminals 1 (G/R) and 2 (B), and between terminals 3 (G/Y) and 4 (PU/W), 5 (P/B), 6 (G), 7 (BR), 8 (G/W) and 9 (GY/R) while moving manual shaft through each position.
      Fig 6: Park Neutral Position Switch Lever Position Chart
      G02160992Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 7: Checking Continuity Between Park/Neutral Position (PNP) Switch Terminals 1 (G/R) And 2 (B), And Between Terminals 3 (G/Y) And 4 (PU/W), 5 (P/B), 6 (G), 7 (BR), 8 (G/W) And 9 (GY/R)
      G02160993Courtesy of NISSAN MOTOR CO., U.S.A.
    • If NG, check again with manual control cable disconnected from manual shaft of A/T assembly. Refer to step a.
    • If OK on step b, adjust manual control cable. Refer to "CONTROL CABLE ADJUSTMENT ".
    • If NG on step b, remove park/neutral position (PNP) switch from A/T and check continuity of park/neutral position (PNP) switch terminals. Refer to step a.
    • If OK on step d, adjust park/neutral position (PNP) switch. Refer to "PARK/NEUTRAL POSITION (PNP) SWITCH ADJUSTMENT ".
    • If NG on step d, replace park/neutral position (PNP) switch.
    • Harness for short or open between ignition switch and park/neutral position (PNP) switch (Main harness)
    • Harness for short or open between park/neutral position (PNP) switch and TCM (Main harness)

    OK or NG 

    1. OK: GO TO  7.
    2. NG: Repair or replace damaged parts.
  5. CHECK 3 POSITION SWITCH CIRCUIT (WITH CONSULT-II) 

    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 3 position switch is indicated properly. (Overdrive switch "ON" displayed on CONSULT-II means overdrive "OFF".)

    OK or NG 

    1. OK: GO TO  7.
    2. NG: GO TO 6.
    Fig 8: Checking 3 Position Switch Circuit (With Consult II)
    G02160994Courtesy of NISSAN MOTOR CO., U.S.A.
  6. DETECT MALFUNCTIONING ITEM 

    Check the following items:

    • 3 position switch M34.
    • Check for continuity between terminals 1 (L/W) and (B) with selector lever in 3 position.
    • Harness for short or open between meter and 3 position switch (Main harness)
    • Harness of ground circuit for 3 position switch (Main harness) for short or open

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Repair or replace damaged parts.
    Fig 9: Checking For Continuity Between Terminals 1 (L/W) And (B) With Selector Lever In 3 Position
    G02160995Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK THROTTLE POSITION SENSOR [ACCELERATOR PEDAL POSITION (APP) SENSOR] 

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Repair or replace damaged parts.
  8. CHECK TCM INSPECTION 
    1. Perform TCM input/output inspection. Refer to "TCM INSPECTION TABLE "

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: Inspect TCM terminals and related wiring harnesses for damage or loose connections. Repair or replace damaged parts.
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