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Nissan Sentra B18 (2020-2025) Service Manual: Input Speed Sensor Circuit

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK HARNESS CONNECTOR - 1

    1. Ignition switch OFF.

    2. Check the mating condition of TCM harness connector and CVT unit harness connector.

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair or replace damaged parts.

  2. CHECK CONNECTOR TERMINAL - 1

    1. Disconnect TCM harness connector and CVT unit harness connector.

    2. Check the connectors of TCM and CVT unit for water intrusion, or damage or corrosion of the terminals.

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair or replace damaged parts.

  3. CHECK DETECTED DTC

    Are other sensor malfunctions detected in addition to input speed sensor?

    YES >>

    GO TO 4.

    NO >>

    GO TO 10.

  4. CHECK SENSOR GROUND CIRCUIT - 1

    1. Connect TCM harness connector.

    2. Check continuity (resistance) between CVT unit harness connector terminal and ground.

      CVT unit

      —

      Continuity (Resistance)

      Connector

      Terminal

      F46

      18

      Ground

      Existed (1 Ω or less)

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    GO TO 5.

  5. CHECK SENSOR GROUND CIRCUIT - 2

    1. Disconnect TCM harness connector.

    2. Check continuity (resistance) between TCM harness connector terminal and CVT unit harness connector terminal.

      TCM

      CVT unit

      Continuity (Resistance)

      Connector

      Terminal

      Connector

      Terminal

      F23

      15

      F46

      18

      Existed (1 Ω or less)

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    Repair harness or connector.

  6. CHECK SENSOR POWER SUPPLY CIRCUIT - 1

    1. If TCM harness connector is disconnected, connect it.

    2. Ignition switch ON.

    3. Check voltage between CVT unit harness connector terminal and ground.

      +

      −

      Voltage (Approx.)

      CVT unit

      Connector

      Terminal

      F46

      22

      Ground

      5 V

    Is the inspection result normal?

    YES >>

    GO TO 10.

    NO >>

    GO TO 7.

  7. CHECK SENSOR POWER SUPPLY CIRCUIT - 2

    1. Ignition switch OFF.

    2. Disconnect TCM harness connector.

    3. Check continuity (resistance) between TCM harness connector terminal and CVT unit harness connector terminal.

      TCM

      CVT unit

      Continuity (Resistance)

      Connector

      Terminal

      Connector

      Terminal

      F23

      26

      F46

      22

      Existed (1 Ω or less)

    Is the inspection result normal?

    YES >>

    GO TO 8.

    NO >>

    Repair harness or connector.

  8. CHECK SENSOR POWER SUPPLY CIRCUIT - 3

    1. Ignition switch ON.

    2. Check voltage between TCM harness connector terminal and ground.

      +

      −

      Voltage (Approx.)

      TCM

      Connector

      Terminal

      F23

      26

      Ground

      0 V

    Is the inspection result normal?

    YES >>

    GO TO 9.

    NO >>

    Repair harness.

  9. CHECK TCM POWER SUPPLY AND GROUND CIRCUITS

    Check TCM power supply and ground circuits. Refer to Diagnosis Procedure.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Repair or replace damaged parts.

  10. CHECK INPUT SPEED SENSOR SIGNAL CIRCUIT

    Check continuity (resistance) between TCM harness connector terminal and CVT unit harness connector terminal.

    TCM

    CVT unit

    Continuity (Resistance)

    Connector

    Terminal

    Connector

    Terminal

    F23

    24

    F46

    17

    Existed (1 Ω or less)

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    Repair harness or connector.

  11. CHECK TCM INPUT SIGNAL (INPUT SPEED SENSOR SIGNAL)

    1. Connect TCM harness connector and CVT unit harness connector.

    2. Start the engine.

    3. Check frequency between TCM harness connector terminal and ground.

      TCM

      —

      Test condition

      Frequency

      Connector

      Terminal

      F23

      24

      Ground

      • Accelerator pedal position: 0.5/8

      • Shift position: “L” position

      • Nissan Sentra Vehicle speed: 20 km/h (12 MPH)

      1050 Hz

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    GO TO 12.

  12. CHECK HARNESS CONNECTOR - 2

    1. Remove transaxle assembly from Nissan Sentra vehicle. Refer to Removal and Installation.

    2. Disassemble transaxle assembly to check input speed sensor harness connector. Refer to Disassembly and Assembly.

    3. Check the mating condition of input speed sensor harness connector.

    Is the inspection result normal?

    YES >>

    GO TO 13.

    NO >>

    Repair or replace damaged parts.

  13. CHECK CONNECTOR TERMINAL - 2

    1. Disconnect input speed sensor harness connector.

    2. Check input speed sensor harness connector for damage of the terminals.

    Is the inspection result normal?

    YES >>

    GO TO 14.

    NO >>

    Repair or replace damaged parts.

  14. CHECK INPUT SPEED SENSOR CIRCUIT - 1

    1. Remove control valve cover. Refer to Removal and Installation.

      CAUTION:

      Never disconnect harness connector F102 inside the CVT unit. Refer to Wiring Diagram.

    2. Check continuity (resistance) between CVT unit connector terminals and input speed sensor harness connector terminals.

    CVT unit

    Input speed sensor

    Continuity (Resistance)

    Terminal

    Connector

    Terminal

    17

    F105

    2

    Existed (1 Ω or less)

    18

    1

    22

    3

    Is the inspection result normal?

    YES >>

    Replace input speed sensor. Refer to Disassembly and Assembly.

    NO >>

    GO TO 15.

  15. CHECK HARNESS CONNECTOR - 3

    Check the mating condition of CVT fluid temperature sensor/input speed sensor harness connector.

    Is the inspection result normal?

    YES >>

    GO TO 16.

    NO >>

    Repair or replace damaged parts.

  16. CHECK CONNECTOR TERMINAL - 3

    1. Disconnect CVT fluid temperature sensor/input speed sensor harness connector.

    2. Check CVT fluid temperature sensor/input speed sensor harness connector for damage of the terminals.

    Is the inspection result normal?

    YES >>

    GO TO 17.

    NO >>

    Repair or replace damaged parts.

  17. CHECK INPUT SPEED SENSOR CIRCUIT - 2

    Check continuity (resistance) between CVT fluid temperature sensor/input speed sensor harness connector terminals and input speed sensor harness connector terminals.

    CVT fluid temperature sensor/input speed sensor

    Input speed sensor

    Continuity (Resistance)

    Connector

    Terminal

    Connector

    Terminal

    F104

    3

    F105

    3

    Existed (1 Ω or less)

    4

    2

    5

    1

    Is the inspection result normal?

    YES >>

    GO TO 18.

    NO >>

    Replace CVT fluid temperature sensor (with input speed sensor harness). Refer to Disassembly and Assembly.

  18. CHECK INPUT SPEED SENSOR CIRCUIT - 3

    Check continuity (resistance) between CVT unit connector terminals and CVT fluid temperature sensor/input speed sensor harness connector terminals.

    CVT unit

    CVT fluid temperature sensor/input speed sensor

    Continuity (Resistance)

    Terminal

    Connector

    Terminal

    17

    F103

    4

    Existed (1 Ω or less)

    18

    5
    22

    3

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace control valve due to harness connector malfunction. Refer to Removal and Installation.

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