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Nissan Sentra B18 (2020-2025) Service Manual: Transmission Range Switch 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 transmission range switch?

    YES >>

    GO TO 4.

    NO >>

    GO TO 5.

  4. CHECK SENSOR GROUND CIRCUIT

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

    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 5.

    NO >>

    Repair harness or connector.

  5. CHECK TRANSMISSION RANGE SWITCH - 1

    Check resistance between CVT unit connector terminals.

    Transmission range switch

    CVT unit

    Test condition

    Resistance

    Terminal

    Switch 1

    6

    18

    Selector lever: “R”, “N” or “D” position

    0 - 2.3 Ω

    Other than the above

    3.7 - 4.1 kΩ

    Switch 2

    7

    Selector lever: “N”, “D” or “L” position

    0 - 2.3 Ω

    Other than the above

    3.7 - 4.1 kΩ

    Switch 3

    8

    Selector lever: “D” or “L” position

    0 - 2.3 Ω

    Other than the above

    3.7 - 4.1 kΩ

    Switch 4

    9

    Selector lever: “R” or “D” position

    0 - 2.3 Ω

    Other than the above

    3.7 - 4.1 kΩ

    Is the inspection result normal?

    YES >>

    GO TO 8.

    NO >>

    GO TO 6.

  6. ADJUSTMENT OF CONTROL CABLE

    Adjust the control cable installation. Refer to Adjustment.

    >>

    GO TO 7.

  7. CHECK TRANSMISSION RANGE SWITCH - 2

    Check resistance between CVT unit connector terminals.

    Transmission range switch

    CVT unit

    Test condition

    Resistance

    Terminal

    Switch 1

    6

    18

    Selector lever: “R”, “N” or “D” position

    0 - 2.3 Ω

    Other than the above

    3.7 - 4.1 kΩ

    Switch 2

    7

    Selector lever: “N”, “D” or “L” position

    0 - 2.3 Ω

    Other than the above

    3.7 - 4.1 kΩ

    Switch 3

    8

    Selector lever: “D” or “L” position

    0 - 2.3 Ω

    Other than the above

    3.7 - 4.1 kΩ

    Switch 4

    9

    Selector lever: “R” or “D” position

    0 - 2.3 Ω

    Other than the above

    3.7 - 4.1 kΩ

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace control valve due to transmission range switch malfunction. Refer to Removal and Installation.

  8. CHECK TRANSMISSION RANGE SWITCH POWER SUPPLY

    1. Connect TCM harness connector.

    2. Ignition switch ON.

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

      Transmission range switch

      +

      −

      Voltage (Approx.)

      CVT unit

      Connector

      Terminal

      Switch 1

      F46

      6

      Ground

      5 V

      Switch 2

      7

      Switch 3

      8

      Switch 4

      9

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    GO TO 9.

  9. CHECK TRANSMISSION RANGE SWITCH CIRCUIT (POWER SUPLLY CIRCUIT) - 1

    1. Ignition switch OFF.

    2. Disconnect TCM harness connector.

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

      Transmission range switch

      TCM

      CVT unit

      Continuity (Resistance)

      Connector

      Terminal

      Connector

      Terminal

      Switch 1

      F23

      4

      F46

      6

      Existed (1 Ω or less)

      Switch 2

      5

      7

      Switch 3

      6

      8

      Switch 4

      7

      9

    Is the inspection result normal?

    YES >>

    GO TO 10.

    NO >>

    Repair harness or connector.

  10. CHECK TRANSMISSION RANGE SWITCH CIRCUIT (POWER SUPLLY CIRCUIT) - 2

    Check continuity between TCM harness connector terminals and ground.

    Transmission range switch

    TCM

    −

    Continuity

    Connector

    Terminal

    Switch 1

    F23

    4

    Ground

    Not existed

    Switch 2

    5

    Switch 3

    6

    Switch 4

    7

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    Repair harness.

  11. CHECK TRANSMISSION RANGE SWITCH CIRCUIT (POWER SUPLLY CIRCUIT) - 3

    1. Ignition switch ON.

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

      Transmission range switch

      +

      −

      Voltage (Approx.)

      TCM

      Connector

      Terminal

      Switch 1

      F23

      4

      Ground

      0 V

      Switch 2

      5

      Switch 3

      6

      Switch 4

      7

    Is the inspection result normal?

    YES >>

    GO TO 12.

    NO >>

    Repair harness.

  12. 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.

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