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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1207 (Automatic Transmission) >> DTC P0720: Vehicle Speed Sensor A/T (Revolution Sensor) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti QX56. 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. Start the engine.
    4. Read out the value of "VHCL/S SE.A/T" while driving. Check the value changes according to driving speed.
      INPUT SIGNAL INSPECTION TABLE

      Item name Condition Display value (km/h)
      VHCL/S SE.A/T During driving Approximately matches the speedometer reading.
      Fig 1: Display DATA MONITOR Mode Screen
      G02382381Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  6.
    2. 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 

    1. OK: GO TO 3.
    2. 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 

    1. OK: GO TO 4.
    2. 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: Park/Neutral Position Switch Connector Terminals & TCM Connector Terminals Continuity Chart
      G02382382Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking Continuity Between Park/Neutral Position Switch Connector Terminals & TCM Connector Terminals
      G02382383Courtesy of NISSAN MOTOR CO., U.S.A.
    4. If OK, check harness for short to ground and short to power.
    5. Reinstall any part removed.

    OK or NG 

    1. OK: GO TO 5.
    2. 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 

    1. OK: INSPECTION END 
    2. 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 

    1. OK: INSPECTION END 
    2. NG: GO TO 2.
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