Nissan Sentra B18 (2020-2025) Service Manual: Cvt Fluid Temperature Sensor Circuit

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 CVT fluid temperature sensor?

   YES >>

   GO TO 4.

   NO >>

   GO TO 5.

4. CHECK SENSOR GROUND 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	15	F46	18	Existed (1 Ω or less)

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair harness or connector.

5. CHECK CVT FLUID TEMPERATURE SENSOR - 1

   1. Connect CVT unit harness connector.

   2. Check resistance between TCM harness connector terminals.

      TCM			Test condition		Resistance
      Connector	Terminal
      F23	12	15	CVT fluid temperature	20°C (68°F)	6.3 – 6.7 kΩ
      				50°C (122°F)	2.1 – 2.3 kΩ
      				80°C (176°F)	0.8 – 0.9 kΩ

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   GO TO 6.

6. CHECK CVT FLUID TEMPERATURE SENSOR - 2

   1. Disconnect CVT unit harness connector.

   2. Check resistance between CVT unit harness connector terminals.

      CVT unit		Test condition		Resistance
      Terminal
      12	18	CVT fluid temperature	20°C (68°F)	6.3 – 6.7 kΩ
      			50°C (122°F)	2.1 – 2.3 kΩ
      			80°C (176°F)	0.8 – 0.9 kΩ

   Is the inspection result normal?

   YES >>

   GO TO 11.

   NO >>

   GO TO 7.

7. CHECK HARNESS CONNECTOR - 2

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

   Is the inspection result normal?

   YES >>

   GO TO 8.

   NO >>

   Repair or replace damaged parts.

8. CHECK CONNECTOR TERMINAL - 2

   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 9.

   NO >>

   Repair or replace damaged parts.

9. CHECK CVT FLUID TEMPERATURE SENSOR CIRCUIT - 1

   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
   12	F103	1	Existed (1 Ω or less)
   18		2

   Is the inspection result normal?

   YES >>

   Replace CVT fluid temperature sensor. Refer to Disassembly and Assembly.

   NO >>

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

10. CHECK CVT FLUID TEMPERATURE SENSOR CIRCUIT - 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	12	F46	12	Existed (1 Ω or less)

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    Repair harness or connector.

11. CHECK CVT FLUID TEMPERATURE SENSOR CIRCUIT - 3

    Check continuity between TCM harness connector terminal and ground.

    TCM		—	Continuity
    Connector	Terminal
    F23	12	Ground	Not existed

    Is the inspection result normal?

    YES >>

    GO TO 12.

    NO >>

    Repair harness.

12. CHECK CVT FLUID TEMPERATURE SENSOR CIRCUIT - 4

    1. Connect TCM harness connector.

    2. Ignition switch ON.

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

       +		—	Voltage (Approx.)
       CVT unit
       Connector	Terminal
       F46	12	Ground	2.5 V

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    GO TO 13.

13. CHECK CVT FLUID TEMPERATURE SENSOR CIRCUIT - 5

    1. Ignition switch OFF.

    2. Disconnect TCM harness connector.

    3. Ignition switch ON.

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

       +		—	Voltage (Approx.)
       CVT unit
       Connector	Terminal
       F46	12	Ground	0 V

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Repair harness.

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