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Home › Infiniti › 2006 › M35 Base › Repair and Diagnosis › Transmission › Automatic Transmission › DTC P1721 Vehicle Speed Sensor MTR › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK CAN COMMUNICATION LINE 

    Perform the self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ", "DIAGNOSTIC PROCEDURE WITHOUT CONSULT-II ".

    Is malfunction in the CAN communication indicated in the result? 

    YES: Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE ".

    NO: GO TO 2.

  2. CHECK INPUT SIGNAL 

    With CONSULT-II 

    1. Start engine.
    2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
    3. Drive vehicle and read out the value of "VHCL/S SE.MTR".
    VHCL/S SE.MTR CONDITION - DISPLAY VALUE

    Item name Condition Display value
    VHCL/S SE.MTR During driving Approximately matches the speedometer reading.
    Fig 1: Identifying CONSULT II DATA MONITOR Display
    G04139205Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: GO TO 3.

  3. CHECK UNIFIED METER AND A/C AMP 

    Check unified meter and A/C amp. Refer to "UNIFIED METER AND A/C AMP ".

    OK or NG 

    OK: GO TO 4.

    NG: Repair or replace damaged parts.

  4. CHECK DTC 

    Perform "DTC Confirmation Procedure". Refer to "DTC CONFIRMATION PROCEDURE ".

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 5.

  5. 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 6.

    NG: Repair or replace damaged parts.

  6. 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: Replace the control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".

    NG: Repair or replace damaged parts.

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