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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2226 (Automatic Transmission) >> DTC/Circuit Diagnosis >> 1ST Position Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CAN COMMUNICATION LINE

    Perform the self-diagnosis. Refer to "CONSULT FUNCTION (TRANSMISSION) ".

    Is any malfunction in the CAN communication indicated in the results? 

    YES: Check CAN communication line. Refer to U1000 CAN COMM CIRCUIT .

    NO: GO TO 2.

  2. CHECK 1ST POSITION SWITCH CIRCUIT

    With CONSULT 

    1. Turn ignition switch "ON".
    2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
    3. Read out "1 POSITION SW".

      Check the signal of the 1st position switch is indicated properly.

      Monitor item Condition Display value
      1 POSITION SW When setting selector lever to "1" position. ON
      When setting selector lever to other positions. OFF

    Without CONSULT 

    1. Turn ignition switch "ON". (Do not start engine)
    2. Check voltage between A/T shift selector connector terminal and ground.
      Item Connector Terminal Condition Data (Approx.)
      1st position switch M156 9 - Ground When setting selector lever to "1" position. 0V
      When setting selector lever to other positions. Battery voltage
      Fig 1: Checking Voltage Between A/T Shift Selector Connector M156 Terminal 9 And Ground
      G08165420Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  5.

      NG: GO TO 3.

  3. CHECK 1ST POSITION SWITCH
    1. Turn ignition switch "OFF".
    2. Disconnect A/T shift selector connector.
    3. Check continuity between A/T shift selector connector terminals.
      Item Connector Terminal Condition Continuity
      1st position switch M156 9 - 10 When setting selector lever to "1" position. Yes
      When setting selector lever to other positions. No
      Fig 2: Checking Continuity Between A/T Shift Selector Connector M156 Terminals 9 And 10
      G08165421Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 4.

      NG: Repair or replace A/T shift selector assembly.

  4. DETECT MALFUNCTIONING ITEM

    Check the following. If any items are damaged, repair or replace damaged parts.

    • Harness for short or open between combination meter connector terminal 18 and A/T shift selector connector terminal 9.
    • Harness for short or open between A/T shift selector connector terminal 10 and ground.

      OK or NG 

      OK: GO TO 5.

      NG: Repair or replace damaged parts.

  5. CHECK COMBINATION METER

    Check the combination meter. Refer to "DIAGNOSIS DESCRIPTION ".

    OK or NG 

    OK: INSPECTION END 

    NO: Repair or replace damaged parts.

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