Nissan Sentra B18 (2020-2025) Service Manual: P0796-00 Pressure Control Solenoid C
Dtc Description
DTC Description
DTC DETECTION LOGIC
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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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 |
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Signal |
— |
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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]
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Diagnosis delay time |
5 seconds × 2 count |
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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 |
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Signal |
— |
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Threshold |
Instruction pressure of secondary pressure - Actual secondary pressure: 1.2 MPa or more |
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Diagnosis delay time |
10 seconds |
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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 |
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Signal |
— |
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Threshold |
Instruction pressure of secondary pressure - Actual secondary pressure: 1.2 MPa or more |
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Diagnosis delay time |
10 seconds |
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DC stands for “DRIVING CYCLE” and indicates a series of driving cycle of “Ignition switch OFF → ON → driving → OFF”.
POSSIBLE CAUSE
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Harness or connector
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Secondary pressure solenoid valve
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Control valve
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TCM
FAIL-SAFE
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Nissan Sentra Vehicle speed < 40 km/h (25 MPH) or Input speed < 1300 rpm
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Selector shock is large
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Start is slow
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Acceleration is slow
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Lock-up is not performed
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Nissan Sentra Vehicle speed is not increased
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Stop/start system prohibited
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Other then the above
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Selector shock is large
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Start is slow
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Acceleration is slow
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Nissan Sentra Vehicle speed is not increased
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Stop/start system prohibited
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DTC CONFIRMATION PROCEDURE
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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.
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CHECK DTC DETECTION
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Start the engine.
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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.
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Stop the Nissan Sentra vehicle and wait at least 30 seconds.
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Repeat step 2 to 3.
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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
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Diagnosis Procedure
Diagnosis Procedure
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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.
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CHECK SECONDARY PRESSURE SOLENOID VALVE CIRCUIT - 1
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Disconnect TCM harness connector.
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Disconnect CVT unit harness connector.
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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.
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REPLACE CONTROL VALVE
Replace control valve. Refer to Removal and Installation.
>>GO TO 6.
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CHECK SECONDARY PRESSURE SOLENOID VALVE CIRCUIT - 2
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Disconnect TCM harness connector.
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Disconnect CVT unit harness connector.
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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 >>-
Repair harness or connector.
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GO TO 5.
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REPLACE BELT AND PULLEYS
Replace belt and pullesy. Refer to Disassembly and Assembly.
>>GO TO 6.
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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
Other materials:
Primary Pressure Solenoid Valve 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 inspect ...
Reference Value
Reference Value
TERMINAL LAYOUT
PHYSICAL VALUES
Terminal No.
(Wire color)
Description
Condition
Value
...
C1741-21 Tire Pressure Sensor No Data Fl
Dtc Description
DTC Description
Note:
The Signal Tech II Tool [– (NI-50190)] can be used
to perform the following functions: Refer to the Signal Tech II User
Guide for additional information.
Activate and display TPMS sensor IDs
Display tire pressure rep ...