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

Nissan Sentra B18 (2020-2025) Service Manual / Transmission & Driveline / Transaxle & Transmission :: Cvt: Re0f15a / Dtc/circuit Diagnosis / Line Pressure Solenoid Valve Circuit

Diagnosis Procedure

Diagnosis Procedure

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.
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.
CHECK DETECTED DTC

Are other solenoid valve malfunctions detected in addition to line pressure solenoid valve?
YES >>
GO TO 4.
NO >>
GO TO 7.

CHECK SOLENOID 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	19	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	43	F46	19	Existed (1 Ω or less)

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

Repair harness or connector.

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 LINE PRESSURE SOLENOID VALVE CIRCUIT - 1

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	30	F46	1	Existed (1 Ω or less)

Is the inspection result normal?

YES >>

GO TO 8.

NO >>

Repair harness or connector.

CHECK LINE PRESSURE SOLENOID VALVE CIRCUIT - 2

Check continuity between TCM harness connector terminal and ground.

TCM		−	Continuity
Connector	Terminal	−	Continuity
F23	30	Ground	Not existed

Is the inspection result normal?

YES >>

GO TO 9.

NO >>

Repair harness.

CHECK LINE PRESSURE SOLENOID VALVE

Check resistance between CVT unit connector terminals.

CVT unit		Test condition		Resistance
Terminal		Test condition		Resistance
1	19	CVT fluid temperature	20°C (68°F)	5.0 – 5.6 Ω
			50°C (122°F)	5.5 – 6.8 Ω
			80°C (176°F)	6.0 – 8.0 Ω

Is the inspection result normal?

YES >>

INSPECTION END

NO >>

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

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