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Nissan Sentra B18 (2020-2025) Service Manual: Secondary 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 secondary speed sensor 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 secondary speed sensor harness connector.

    2. Check the connectors of TCM and secondary speed sensor 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 primary speed sensor malfunction detected in addition to secondary 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 secondary speed sensor harness connector terminal and ground.

      Secondary speed sensor

      —

      Continuity (Resistance)

      Connector

      Terminal

      F54

      2

      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 secondary speed sensor harness connector terminal.

      TCM

      Secondary speed sensor

      Continuity (Resistance)

      Connector

      Terminal

      Connector

      Terminal

      F23

      11

      F54

      2

      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. Connect TCM harness connector.

    2. Ignition switch ON.

    3. Check voltage between secondary speed sensor harness connector terminal and ground.

      +

      −

      Voltage (Approx.)

      Secondary speed sensor

      Connector

      Terminal

      F54

      3

      Ground

      5 V

    Is the inspection result normal?

    YES >>

    GO TO 9.

    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 secondary speed sensor harness connector terminal.

      TCM

      Secondary speed sensor

      Continuity (Resistance)

      Connector

      Terminal

      Connector

      Terminal

      F23

      36

      F54

      3

      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

      36

      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 SECONDARY SPEED SENSOR SIGNAL CIRCUIT

    Check continuity (resistance) between TCM harness connector terminal and secondary speed sensor harness connector terminal.

    TCM

    Secondary speed sensor

    Continuity (Resistance)

    Connector

    Terminal

    Connector

    Terminal

    F23

    34

    F54

    1

    Existed (1 Ω or less)

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    Repair harness or connector.

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

    1. Connect TCM harness connector and secondary speed sensor harness connector.

    2. Start the engine.

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

      TCM

      −

      Test condition

      Frequency

      Connector

      Terminal

      F23

      34

      Ground

      • Accelerator pedal position: 0.5/8

      • Shift position: “L” position

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

      600 Hz

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace secondary speed sensor. Refer to Removal and Installation.

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