Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Infiniti >> 2003 >> I35 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle >> Diagnostic Trouble Code Definitions >> DTC P0720: Vehicle Speed Sensor.A/T (Revolution Sensor) >> Diagnostic Procedure

Diagnostic Procedure

  1. Check Input Signal (With Consult-II) 

    With CONSULT-II 

    1. Start engine.
    2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
    3. Read out the value of "VHCL/S SE.A/T" while driving.

      Check the value changes according to driving speed.

      Fig 1: Display Data Monitor Mode For A/T With Consult-II
      G02090621Courtesy of NISSAN MOTOR CO., U.S.A.
    1. OK or NG 

    OK: GO TO  3.

    NG: GO TO 2.

  2. Check Revolution Sensor (With CONSULT-II) 

    With CONSULT-II 

    1. Start engine.
      Fig 2: Checking Input Signal (With Consult-II)
      G02090622Courtesy of NISSAN MOTOR CO., U.S.A.
      • Harness for short or open between TCM, ECM and revolution sensor
      • Harness for short or open between ignition switch and revolution sensor
    1. OK or NG 

    OK: GO TO 3.

    NG: Repair or replace damaged parts.

  3. Check DTC 

    Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE .

    1. OK or NG 

    OK: INSPECTION END 

    NG: GO TO 4.

  4. Check TCM Inspection 
    1. Perform TCM input/output signal inspection.
    2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
    1. OK or NG 

    OK: Inspection End 

    NG: Repair or replace damaged parts.