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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 1056 (Automatic Transaxle Overhaul & Diagnostics) >> Re4F04B >> DTC P0720 Vehicle Speed Sensor.A/T (Revolution Sensor) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK INPUT SIGNAL (WITH CONSULT-II) 

    With CONSULT-II 

    1. Start engine.
      Fig 1: CONSULT-II Display - DATA MONITOR
      G00739917Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Select "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.

    OK or NG 

    1. OK: GO TO  5.
    2. NG: GO TO 2.
  2. CHECK REVOLUTION SENSOR (WITH CONSULT-II) 

    With CONSULT-II 

    1. Start engine.
      Fig 2: Vehicle Condition - Judgement Standard Chart
      G00739918Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check pulse between TCM harness connector E143 terminal 29 (W) and ground.
      Fig 3: Checking Pulse Between TCM Harness Connector E143 Terminal 29 (W) And Ground
      G00739919Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  5.
    2. NG: GO TO 3.
  3. CHECK POWER FOR REVOLUTION SENSOR 
    1. Turn ignition switch to OFF position.
      Fig 4: Checking Voltage Between Revolution Sensor Harness Connector F38 Terminal 1 (R/Y) And Ground
      G00739920Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Disconnect the revolution sensor harness connector.
    3. Turn ignition switch to ON position. (Do not start engine.)
    4. Check voltage between revolution sensor harness connector F38 terminal 1 (R/Y) and ground.

      Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Check the following items. If any items is damaged, repair or replace damaged parts.
      • Fuse
      • Harness for short or open between ignition switch and revolution sensor
      • Ignition switch

        Refer to "POWER DISTRIBUTION ".

  4. DETECT MALFUNCTIONING ITEM 

    Check harness for short or open between TCM, ECM and revolution sensor.

    OK or NG 

    1. OK: Repair or replace revolution sensor.
    2. NG: Repair or replace damaged parts.
  5. CHECK DTC 

    Perform "DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE ".

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO 6.
  6. CHECK TCM INSPECTION 
    1. perform TCM input/output signal inspection. Refer to "TCM TERMINALS AND REFERENCE VALUE ".
    2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: Repair or replace damaged parts.