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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1050 (Automatic Transmission) >> DTC/Circuit Diagnosis >> DTC P0720: Output Speed Sensor >> 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 INPUT SIGNAL

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
    3. Start the engine.
    4. Read out the value of "VHCL/S SE-A/T" while driving.

      Check the value changes according to driving speed.

      OK or NG 

      OK: GO TO  6.

      NG: GO TO 2.

  2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

    Check TCM power supply and ground circuit. Refer to "DIAGNOSIS PROCEDURE ".

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace damaged parts.

  3. DETECT MALFUNCTIONING ITEM

    Check the following.

    • The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.

      OK or NG 

      OK: GO TO 4.

      NG: Repair or replace damaged parts.

  4. CHECK SUB-HARNESS
    1. Remove control valve with TCM. Refer to "REMOVAL AND INSTALLATION ".
    2. Disconnect transmission range switch connector and TCM connector.
    3. Check continuity between transmission range switch connector (A) terminals and TCM connector (B) terminals.
      Item Connector Terminal Continuity
      Transmission range switch connector F505 8 Yes
      TCM connector F503 20
      Transmission range switch connector F505 9 Yes
      TCM connector F503 17
      Transmission range switch connector F505 10 Yes
      TCM connector F503 16
      Fig 1: Checking Continuity Between Transmission Range Switch Connector Terminals And TCM Connector Terminals
      G08165404Courtesy of NISSAN NORTH AMERICA, INC.
    4. If OK, check harness for short to ground and short to power.
    5. Reinstall any part removed.

      OK or NG 

      OK: GO TO 5.

      NG: Replace open circuit or short to ground and short to power in harness or connectors.

  5. REPLACE THE OUTPUT SPEED SENSOR AND CHECK DTC
    1. Replace the output speed sensor. Refer to DISASSEMBLY .
    2. Perform "DTC Confirmation Procedure". Refer to "DTC CONFIRMATION PROCEDURE ".

      OK or NG 

      OK: INSPECTION END 

      NG: Replace the control valve with TCM. Refer to "REMOVAL AND INSTALLATION ".

  6. CHECK DTC

    Perform "DTC Confirmation Procedure".

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