Nissan Sentra B18 (2020-2025) Service Manual: P0796-00 Pressure Control Solenoid C

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0796	00	PRESSURE CONTROL SOLENOID C (Pressure Control Solenoid "C" Performance/Stuck Off)	1	Diagnosis conditions	Diagnosis is permitted when all of the following conditions are satisfied: a) Ignition voltage ≥ 9.01 V b) Battery voltage ≥ 9.01 V c) CVT fluid temperature ≥ -20 °C (-4 °F) d) Lock-up pattern: Lock-up ON or Lock-up OFF e) Engine speed > 450 rpm
				Signal	—
				Threshold	When the following conditions "a" and "b" are satisfied for the specified period [5 sec] continuously. Keep the same conditions for specified period again after interval. a) Secondary pulley sensor pressure < Line pressure sensor pressure - Variation b) Secondary pulley sensor pressure < Secondary pulley sensor instruction pressure - Variation [Interval] Movement of target pressure ⇒ Target pressure under satisfied oil pressure difference judgement - Current target pressure ≥ 1 MPa Stop valid judgement ⇒ Nissan Sentra Vehicle speed ≤ 3 km/h (2 MPH)
				Diagnosis delay time	5 seconds × 2 count
			2	Diagnosis conditions	Diagnosis is permitted when all of the following conditions are satisfied: a) Engine speed > 625 rpm b) Shift position: Other than P/N position c) CVT fluid temperature ≥ -20 °C (-4 °F) d) Power supply voltage ≥ 10 V e) A drop in secondary pressure is detected during steady state. (Both "e-1" and "e-2" are satisfied twice in the same DC. There is an interval of 30 seconds between the first and second judgment): e-1) When all of the following condition are satisfied and this state is maintained for 1.52 seconds: e-1-1) Current accelerator opening - Accelerator opening when secondary pressure drop is judged ≤ 5 deg e-1-2) Current Nissan Sentra vehicle speed - Vehicle speed when secondary pressure drop is judged ≤ 15 km/h e-2) When all of the following condition are satisfied and this state is maintained for 1.52 seconds: e-2-1) Actual secondary pressure < oil balance low limit pressure e-2-2) Instruction pressure of secondary pressure after filtering - Actual secondary pressure: More than 0.25 MPa
				Signal	—
				Threshold	Instruction pressure of secondary pressure - Actual secondary pressure: 1.2 MPa or more
				Diagnosis delay time	10 seconds
			3	Diagnosis conditions	Diagnosis is permitted when all of the following conditions are satisfied: a) Engine speed > 625 rpm b) Shift position: Other than P/N position c) CVT fluid temperature ≥ -20 °C (-4 °F) d) Power supply voltage ≥ 10 V e) A drop in secondary pressure is detected during the transitional period. (Both "e-1" and "e-2" are satisfied) e-1) When all of the following condition are satisfied and this state is maintained for 1 second: e-1-1) Actual secondary pressure < oil balance low limit pressure e-1-2) Instruction pressure of secondary pressure after filtering - Actual secondary pressure: More than 0.25 MPa e-2) When any of the following conditions are satisfied e-2-1) Oil balance pressure - Actual secondary pressure ≥ 2 MPa e-2-2) Instruction secondary pressure - Actual secondary pressure ≥ 2 MPa
				Signal	—
				Threshold	Instruction pressure of secondary pressure - Actual secondary pressure: 1.2 MPa or more
				Diagnosis delay time	10 seconds

Note:

DC stands for “DRIVING CYCLE” and indicates a series of driving cycle of “Ignition switch OFF → ON → driving → OFF”.

POSSIBLE CAUSE

• Harness or connector

• Secondary pressure solenoid valve

• Control valve

• TCM

FAIL-SAFE

• Nissan Sentra Vehicle speed < 40 km/h (25 MPH) or Input speed < 1300 rpm

  • Selector shock is large

  • Start is slow

  • Acceleration is slow

  • Lock-up is not performed

  • Nissan Sentra Vehicle speed is not increased

  • Stop/start system prohibited

• Other then the above

  • Selector shock is large

  • Start is slow

  • Acceleration is slow

  • Nissan Sentra Vehicle speed is not increased

  • Stop/start system prohibited

DTC CONFIRMATION PROCEDURE

1. PREPARATION BEFORE WORK

   If another "DTC CONFIRMATION PROCEDURE" occurs just before, ignition switch OFF and wait for at least 10 seconds, then perform the next test.

   TESTING CONDITION:

   Before performing the following procedure, confirm that battery voltage is more than 10 V.

   >>

   GO TO 2.

2. CHECK DTC DETECTION

   1. Start the engine.

   2. Drive the Nissan Sentra vehicle and maintain the following conditions for 20 seconds or more.

      Shift position	: "D" position
      CVT fluid temperature	: 25 °C (77 °F) - 120 °C (248 °F)
      Nissan Sentra Vehicle speed	: 40 km/h (25 MPH) or more

      CAUTION:

      Be careful of the driving speed.

   3. Stop the Nissan Sentra vehicle and wait at least 30 seconds.

   4. Repeat step 2 to 3.

   5. Check the DTC.

   Is "P0796-00" detected?

   YES >>

   Proceed to Diagnosis Procedure.

   NO-1>>

   To check malfunction symptom before repair: Refer to Intermittent Incident.

   NO-2>>

   Confirmation after repair: INSPECTION END

Diagnosis Procedure

Diagnosis Procedure

1. INSPECT CVT STEEL BELT

   Inspect the CVT steel belt. Refer to Component Inspection.

   Is CVT steel belt OK?

   YES >>

   GO TO 2.

   NO >>

   GO TO 4.

2. CHECK SECONDARY PRESSURE SOLENOID VALVE CIRCUIT - 1

   1. Disconnect TCM harness connector.

   2. Disconnect CVT unit harness connector.

   3. Check resistance between TCM harness connector terminal and CVT unit harness connector terminal.

      TCM		CVT unit		Resistance
      Connector	Terminal	Connector	Terminal
      F23	39	F46	3	1 Ω or less

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Repair harness or connector.

3. REPLACE CONTROL VALVE

   Replace control valve. Refer to Removal and Installation.

   >>

   GO TO 6.

4. CHECK SECONDARY PRESSURE SOLENOID VALVE CIRCUIT - 2

   1. Disconnect TCM harness connector.

   2. Disconnect CVT unit harness connector.

   3. Check resistance between TCM harness connector terminal and CVT unit harness connector terminal.

      TCM		CVT unit		Resistance
      Connector	Terminal	Connector	Terminal
      F23	39	F46	3	1 Ω or less

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   1. Repair harness or connector.

   2. GO TO 5.

5. REPLACE BELT AND PULLEYS

   Replace belt and pullesy. Refer to Disassembly and Assembly.

   >>

   GO TO 6.

6. CHECK DTC DETECTION

   Perform DTC confirmation procedure. Refer to DTC Description.

   Is "P0796-00" detected again?

   YES >>

   Replace TCM. Refer to Removal and Installation.

   NO >>

   INSPECTION END