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Home >> Nissan-Datsun >> 2008 >> Sentra SE-R >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Continuously Variable Transmission (CVT) >> DTC P0715 Input Speed Sensor Circuit (PRI Speed Sensor) >> Diagnostic Procedure
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Diagnostic Procedure

  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".
      ITEM NAME CONDITION CHART

      Item name Condition Display value
      PRI SPEED SEN During driving (lock up ON) Approximately matches the speedometer reading.

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 2.

  2. CHECK PRIMARY SPEED SENSOR 

    With CONSULT-III 

    1. Start engine.
    2. Check power supply to input speed sensor (primary speed sensor) by voltage between TCM connector terminals 25, 46 and 48. Refer to "CIRCUIT DIAGRAM ".
      VOLTAGE SPECIFICATION CHART

      Item Connector Terminal Data (Approx.)
      TCM F23 25 - 46 Battery voltage
      25 - 48
    3. If OK, check the pulse when vehicle cruises.
      CONNECTOR TERMINAL REFERENCE CHART

      Name Condition
      Input speed sensor (Primary speed sensor) When running at 20 km/h (12 MPH) in "L" position, use the CONSULT-III pulse frequency measuring function.
      CAUTION: Connect the data link connector to the vehicle-side diagnosis connector.
      CONNECTOR TERMINAL REFERENCE CHART

      Item Connector Terminal Name Data (Approx.)
      TCM F23 33 Input speed sensor (Primary speed sensor) 890 Hz

    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 input speed sensor (primary speed sensor) harness connector.
    3. Turn ignition switch ON.
    4. Check voltage between input speed sensor (primary speed sensor) harness connector terminals.
      VOLTAGE SPECIFICATION CHART

      Item Connector Terminal Data (Approx.)
      Input speed sensor (Primary speed sensor) F38 3 - 1 Battery voltage
      Fig 1: Checking Voltage Between Input Speed Sensor (Primary Speed Sensor) Harness Connector Terminals
      G04927036Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Check voltage between input speed sensor (primary speed sensor) harness connector terminal and ground.
      VOLTAGE SPECIFICATION CHART

      Item Connector Terminal Data (Approx.)
      Input speed sensor (Primary speed sensor) F38 3 - ground Battery voltage
    6. If OK, check harness for short to ground and short to power.
    7. Reinstall any part removed.
      Fig 2: Checking Voltage Between Input Speed Sensor Harness Connector Terminal And Ground
      G04927037Courtesy of NISSAN MOTOR CO., U.S.A.

    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 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR) 
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector (A) and input speed sensor (primary speed sensor) harness connector (B).
    3. Check continuity between TCM connector (A) terminal and input speed sensor (primary speed sensor) harness connector (B) terminal.
      CONTINUITY REFERENCE CHART

      Item Connector Terminal Continuity
      TCM F23 33 Yes
      Input speed sensor (Primary speed sensor) F38 2
      Fig 3: Checking Continuity Between TCM Connector Terminal And Input Speed Sensor Harness Connector Terminal
      G04927038Courtesy 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 "P0715 PRI SPEED SEN" detected again? 

    YES: Replace the Primary speed sensor. Refer to "PRIMARY SPEED SENSOR ".

    NO: Replace TCM. Refer to "REMOVAL AND INSTALLATION ".

  6. CHECK HARNESS BETWEEN TCM AND INPUT SPEED SENSOR (PRIMARY SPEED SENSOR) (POWER) 
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector, IPDM E/R connector, input speed sensor (primary speed sensor) and output speed sensor (secondary speed sensor) harness connector.
    3. Check continuity between TCM connector terminals, IPDM E/R harness connector terminal, input speed sensor (primary speed sensor) harness connector terminal and output speed sensor (secondary speed sensor) harness connector terminal. Refer to "CIRCUIT DIAGRAM ".
      CONTINUITY REFERENCE CHART

      Item Connector Terminal Continuity
      TCM(1) F23 46, 48 Yes
      IPDM E/R(1) E43 14
      Input speed sensor (Primary speed sensor)(1) F38 3
      Output speed sensor (Secondary speed sensor)(1) F30 3
      (1) Vehicle side
    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. 49, 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 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR) (SENSOR GROUND) 
    1. Turn ignition switch OFF.
    2. Disconnect TCM connector (A) and input speed sensor (primary speed sensor) harness connector (B).
    3. Check continuity between TCM (A) connector terminal and input speed sensor (primary speed sensor) harness connector (B) terminal.
      CONTINUITY REFERENCE CHART

      Item Connector Terminal Continuity
      TCM F23 25 Yes
      Input speed sensor (Primary speed sensor) F38 1
    4. If OK, check harness for short to ground and short to power.
    5. Reinstall any part removed.
      Fig 4: Checking Continuity Between TCM Connector Terminal And Input Speed Sensor Harness Connector Terminal
      G04927039Courtesy of NISSAN MOTOR CO., U.S.A.

    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 ".

    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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