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Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1664 (Automatic Transmission) >> DTC P0720 Vehicle Speed Sensor A/T (Revolution Sensor) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2006 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK INPUT SIGNAL 

    With CONSULT-II 

    1. Turn ignition switch ON.
    2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
      3. Fig 1: CONSULT-II Display - DATA MONITOR
      G04185813Courtesy of NISSAN MOTOR CO., U.S.A.
    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.
      ITEM CONDITION SPECIFICATION

      Item name Condition Display value (km/h)
      VHCL/S SE.A/T During driving Approximately matches the speedometer reading.

    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 "MAIN POWER SUPPLY AND GROUND CIRCUIT ".

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace damaged parts.

  3. DETECT MALFUNCTIONING ITEM 

    Check the following items:

    • 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 "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
    2. Disconnect park/neutral position switch connector and TCM connector.
    3. Check continuity between park/neutral position switch connector terminals and TCM connector terminals.
      Fig 2: Checking Continuity Between Park/Neutral Position Switch Connector Terminals And TCM Connector Terminals
      G04185814Courtesy of NISSAN MOTOR CO., U.S.A.
      TERMINAL CONTINUITY SPECIFICATION

      Item Connector Terminal Continuity
      Park/neutral position switch connector F505 8 Yes
      TCM connector F503 20
      Park/neutral position switch connector F505 9 Yes
      TCM connector F503 17
      Park/neutral position switch connector F505 10 Yes
      TCM connector F503 16
    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 REVOLUTION SENSOR AND CHECK DTC 
    1. Replace the revolution 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 "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".

  6. CHECK DTC 

    Perform "DTC Confirmation Procedure".

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  2.

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