Nissan Sentra B18 (2020-2025) Service Manual / Transmission & Driveline / Transaxle & Transmission :: Cvt: Re0f15a / Dtc/circuit Diagnosis / Input Speed Sensor Circuit

Nissan Sentra B18 (2020-2025) Service Manual: Input Speed Sensor Circuit

Diagnosis Procedure

Diagnosis Procedure

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.
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.
CHECK DETECTED DTC

Are other sensor malfunctions detected in addition to input speed sensor?
YES >>
GO TO 4.
NO >>
GO TO 10.

CHECK SENSOR GROUND CIRCUIT - 1

Connect TCM harness connector.

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

CVT unit		—	Continuity (Resistance)
Connector	Terminal	—	Continuity (Resistance)
F46	18	Ground	Existed (1 Ω or less)

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

GO TO 5.

CHECK SENSOR GROUND CIRCUIT - 2

Disconnect TCM harness connector.

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

TCM		CVT unit		Continuity (Resistance)
Connector	Terminal	Connector	Terminal	Continuity (Resistance)
F23	15	F46	18	Existed (1 Ω or less)

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

Repair harness or connector.

CHECK SENSOR POWER SUPPLY CIRCUIT - 1

If TCM harness connector is disconnected, connect it.
Ignition switch ON.

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.

CHECK SENSOR POWER SUPPLY CIRCUIT - 2

Ignition switch OFF.
Disconnect TCM harness connector.

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

TCM		CVT unit		Continuity (Resistance)
Connector	Terminal	Connector	Terminal	Continuity (Resistance)
F23	26	F46	22	Existed (1 Ω or less)

Is the inspection result normal?

YES >>

GO TO 8.

NO >>

Repair harness or connector.

CHECK SENSOR POWER SUPPLY CIRCUIT - 3

Ignition switch ON.

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.

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.

CHECK INPUT SPEED 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	Continuity (Resistance)
F23	24	F46	17	Existed (1 Ω or less)

Is the inspection result normal?

YES >>

GO TO 11.

NO >>

Repair harness or connector.

CHECK TCM INPUT SIGNAL (INPUT SPEED SENSOR SIGNAL)

Connect TCM harness connector and CVT unit harness connector.
Start the engine.

Check frequency between TCM harness connector terminal and ground.

TCM		—	Test condition	Frequency
Connector	Terminal	—	Test condition	Frequency
F23	24	Ground	Accelerator pedal position: 0.5/8 Shift position: “L” position Nissan Sentra Vehicle speed: 20 km/h (12 MPH)	1050 Hz

Is the inspection result normal?

YES >>

INSPECTION END

NO >>

GO TO 12.

CHECK HARNESS CONNECTOR - 2
1. Remove transaxle assembly from Nissan Sentra vehicle. Refer to Removal and Installation.
2. Disassemble transaxle assembly to check input speed sensor harness connector. Refer to Disassembly and Assembly.
3. Check the mating condition of input speed sensor harness connector.
Is the inspection result normal?
YES >>
GO TO 13.
NO >>
Repair or replace damaged parts.
CHECK CONNECTOR TERMINAL - 2
1. Disconnect input speed sensor harness connector.
2. Check input speed sensor harness connector for damage of the terminals.
Is the inspection result normal?
YES >>
GO TO 14.
NO >>
Repair or replace damaged parts.

CHECK INPUT SPEED SENSOR CIRCUIT - 1

Remove control valve cover. Refer to Removal and Installation.

CAUTION:

Never disconnect harness connector F102 inside the CVT unit. Refer to Wiring Diagram.
Check continuity (resistance) between CVT unit connector terminals and input speed sensor harness connector terminals.

CVT unit	Input speed sensor		Continuity (Resistance)
Terminal	Connector	Terminal	Continuity (Resistance)
17	F105	2	Existed (1 Ω or less)
18		1
22		3

Is the inspection result normal?

YES >>

Replace input speed sensor. Refer to Disassembly and Assembly.

NO >>

GO TO 15.

CHECK HARNESS CONNECTOR - 3

Check the mating condition of CVT fluid temperature sensor/input speed sensor harness connector.
Is the inspection result normal?
YES >>
GO TO 16.
NO >>
Repair or replace damaged parts.
CHECK CONNECTOR TERMINAL - 3
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 17.
NO >>
Repair or replace damaged parts.

CHECK INPUT SPEED SENSOR CIRCUIT - 2

Check continuity (resistance) between CVT fluid temperature sensor/input speed sensor harness connector terminals and input speed sensor harness connector terminals.

CVT fluid temperature sensor/input speed sensor		Input speed sensor		Continuity (Resistance)
Connector	Terminal	Connector	Terminal	Continuity (Resistance)
F104	3	F105	3	Existed (1 Ω or less)
	4		2
	5		1

Is the inspection result normal?

YES >>

GO TO 18.

NO >>

Replace CVT fluid temperature sensor (with input speed sensor harness). Refer to Disassembly and Assembly.

CHECK INPUT SPEED SENSOR CIRCUIT - 3

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	Continuity (Resistance)
17	F103	4	Existed (1 Ω or less)
18		5
22		3

Is the inspection result normal?

YES >>

INSPECTION END

NO >>

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

 Secondary Pressure Sensor Circuit

Diagnosis Procedure Diagnosis Procedure CHECK HARNESS CONNECTOR Ignition switch OFF. Check the mating condition of TCM harness connector and CVT unit harness connector. Is the i...

 Primary Speed Sensor Circuit

Diagnosis Procedure Diagnosis Procedure CHECK HARNESS CONNECTOR - 1 Ignition switch OFF. Check the mating condition of TCM harness connector and primary speed sensor harness con...

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