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Nissan Sentra B18 (2020-2025) Service Manual: Line Pressure Sensor Circuit

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK HARNESS CONNECTOR

    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. 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 line pressure 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 the 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 LINE PRESSURE 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

    18

    F46

    15

    Existed (1 Ω or less)

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    Repair harness or connector.

  11. CHECK TCM INPUT SIGNAL (LINE PRESSURE SENSOR SIGNAL)

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

    2. Start the engine.

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

      +

      −

      Test condition

      Voltage (Approx.)

      TCM

      Connector

      Terminal

      F23

      18

      Ground

      • After engine warm up

      • Shift position: “N” position

      • At idle

      1.629 V

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace control valve due to line pressure sensor malfunction. Refer to Removal and Installation.

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