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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2090 (Continuously Variable Transmission (CVT)) >> DTC P0720 Vehicle Speed Sensor CVT (Secondary Speed Sensor) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK INPUT SIGNAL 

    With CONSULT-III 

    1. Start engine.
    2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
    3. Start vehicle and read out the value of "VSP SENSOR".
    VSP SENSOR DISPLAY VALUE

    Item name Condition Display value
    VSP SENSOR During driving Approximately matches the speedometer reading.

    OK or NG 

    OK: GO TO  8.

    NG: GO TO  2.

  2. CHECK SECONDARY SPEED SENSOR 

    With CONSULT-III 

    1. Start engine.
    2. Check power supply to output speed sensor (secondary speed sensor) by voltage between TCM connector terminals 10, 19 and 42. Refer to "CIRCUIT DIAGRAM ".
      TCM CONNECTOR TERMINALS 10, 19 AND 42

      Item Connector Terminal Data (Approx.)
      TCM F56, F57 10 - 42 Battery voltage
      19 - 42
    3. If OK, check the pulse when vehicle cruises.
    OUTPUT AND SECONDARY SPEED SENSOR CONDITION

    Name Condition
    Output speed sensor (Secondary speed sensor) When running at 20 km/h (12 MPH) in M1 position, use the CONSULT-IIIpulse frequency measuring function.
    CAUTION: Connect the data link connector to the vehicle-side diagnosis connector.
    TCM CONNECTOR TERMINAL 29

    Item Connector Terminal Name Data (Approx.)
    TCM F57 29 Output speed sensor (Secondary speed sensor) 400 Hz
    Fig 1: Checking Voltage Between TCM Connector Terminals
    G04916088Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  8.

    NG: GO TO  3.

  3. CHECK POWER AND SENSOR GROUND 
    1. Turn ignition switch OFF.
    2. Disconnect the output speed sensor (secondary speed sensor) harness connector.
    3. Turn ignition switch ON.
    4. Check voltage between output speed sensor (secondary speed sensor) harness connector terminals.
      OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) HARNESS CONNECTOR TERMINALS (1 OF 2)

      Item Connector Terminal Data (Approx.)
      Output speed sensor (Secondary speed sensor) F38 1 - 3 Battery voltage
      Fig 2: Checking Voltage Between Output Speed Sensor (Secondary Speed Sensor) Harness Connector Terminals
      G04916089Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Check voltage between output speed sensor (secondary speed sensor) harness connector terminal and ground.
      OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) HARNESS CONNECTOR TERMINALS (2 OF 2)

      Item Connector Terminal Data (Approx.)
      Output speed sensor (Secondary speed sensor) F38 3 - ground Battery voltage
      Fig 3: Checking Voltage Between Output Speed Sensor (Secondary Speed Sensor) Harness Connector Terminal And Ground
      G04916090Courtesy of NISSAN MOTOR CO., U.S.A.
    6. If OK, check harness for short to ground and short to power.
    7. Reinstall any part removed.

    OK or NG 

    OK: GO TO  4.

    NG - 1: Battery voltage is not supplied between terminals 1 and 3, terminals 1 and ground.: GO TO  6.

    NG - 2: Battery voltage is not supplied between terminals 1 and 3 only.: GO TO  7.

  4. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) 
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector and output speed sensor (secondary speed sensor) harness connector.
    3. Check continuity between TCM connector terminal and output speed sensor (secondary speed sensor) harness connector terminal.
      TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR)

      Item Connector Terminal Continuity
      TCM F57 29 Yes
      Output speed sensor (Secondary speed sensor) F38 2
      Fig 4: Checking Harness Between TCM And Output Speed Sensor (Secondary Speed Sensor)
      G04916091Courtesy 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 

    OK: GO TO  5.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK THE TCM SHORT 

    Replace same type TCM, perform self-diagnosis check. Erase self-diagnostic results and them drive the vehicle [more than 40 km/h (25 MPH)], perform self-diagnosis check. Refer to "DTC CONFIRMATION PROCEDURE ".

    Is "P0720 VEH SPD SEN/CIR AT" detected again? 

    YES: Replace the transaxle assembly. Refer to "REMOVAL AND INSTALLATION ".

    NO: Replace TCM. Refer to "PRECAUTIONS FOR TCM AND CVT ASSEMBLY REPLACEMENT ".

  6. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (POWER) 
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector and output speed sensor (secondary speed sensor) harness connector.
    3. Check continuity between TCM connector terminals and output speed sensor (secondary speed sensor) harness connector terminal. Refer to "CIRCUIT DIAGRAM ".
      TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (POWER)

      Item Connector Terminal Continuity
      TCM F56 10 Yes
      Output speed sensor (Secondary speed sensor) F38 3
      TCM F56 19 Yes
      Output speed sensor (Secondary speed sensor) F38 3
      Fig 5: Checking Harness Between TCM And Output Speed Sensor (Secondary Speed Sensor) (Power)
      G04916092Courtesy 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 

    OK: 10 A fuse (No. 48, located in the IPDM E/R) or ignition switch are malfunctioning.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  7. CHECK HARNESS BETWEEN TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (SENSOR GROUND) 
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector and output speed sensor (secondary speed sensor) harness connector.
    3. Check continuity between TCM connector terminal and output speed sensor (secondary speed sensor) harness connector terminal.
      TCM AND OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) (SENSOR GROUND)

      Item Connector Terminal Continuity
      TCM F57 42 Yes
      Output speed sensor (Secondary speed sensor) F38 1
      Fig 6: Checking Harness Between TCM And Output Speed Sensor (Secondary Speed Sensor) (Sensor Ground)
      G04916093Courtesy 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 

    OK: GO TO  8.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  8. CHECK DTC 

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

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  9.

  9. CHECK TCM 
    1. Check TCM input/output signals. Refer to "TCM INPUT/OUTPUT SIGNAL REFERENCE VALUES ".
    2. If NG, re-check TCM pin terminals for damage or loose connection with harness connector.

    OK or NG 

    OK: INSPECTION END 

    NG: Repair or replace damaged parts.

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