Nissan Sentra B18 (2020-2025) Service Manual: Transmission Range Switch Circuit

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.

© 2014-2026 Copyright www.nisentra.com