Nissan Murano: Dtc/circuit Diagnosis / P0776 Pressure Control Solenoid B

Nissan Murano (Z52) 2015-2024 Service Manual / Transmission & Driveline / Transaxle & Transmission :: Cvt: Re0f10j / Dtc/circuit Diagnosis / P0776 Pressure Control Solenoid B

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content) 		DTC detection condition
P0776

PC SOLENOID B

(Pressure Control Solenoid “B” Performance/Stuck Off) 		1 Diagnosis condition

When all of the following conditions are satisfied:

  • DTC other than the applicable DTC is not detected.

  • Engine speed: More than 625 rpm

  • Shift position: Other than P/N position

  • CVT fluid temperature: More than -20°C (-4°F)

  • TCM power supply: More than 11 V

  • The difference between instruction pressure of secondary pressure and 10-msec-ago instruction secondary pressure is 0 MPa or more

  • Instruction pressure of secondary pressure: 0 MPa or more
Signal —
Threshold

  1. When the following condition is satisfied and this state is maintained for 5.5 seconds:

    • Actuatl secondary pressure - Instruction pressure of secondary pressure: 1.2 MPa or more

  2. After the above condition "1" is satisfied:

    Actuatl secondary pressure - Instruction pressure of secondary pressure: 1.2 MPa or more
Diagnosis delay time Maintained for 10 seconds or more
2 Diagnosis condition

When all of the following conditions are satisfied:

  • DTC other than the applicable DTC is not detected.

  • Engine speed: More than 625 rpm

  • Shift position: Other than P/N position

  • CVT fluid temperature: More than -20°C (-4°F)

  • TCM power supply: More than 11 V

  • The difference between instruction pressure of secondary pressure and 10-msec-ago instruction secondary pressure is 0 MPa or more

  • Instruction pressure of secondary pressure: 0 MPa or more
Signal —
Threshold

  1. When the following condition "a" is satisfied twice in the same DC:

    • a. When all of the following condition a-1 to a-4 are satisfied and this state is maintained for 1.52 seconds:

      • a-1. Instruction pressure of secondary pressure - Actual secondary pressure: 0.25 MPa or more

      • a-2.Actual secondary pressure - low limit of oil level: Less than 0 MPa

      • a-3. Current accelerator pedal position - Accelerator pedal position when all conditions of the diagnosis condition and above condition a-1 to a-2 are met : Less than 5 deg

      • a-4: Current Nissan Murano vehicle speed - Vehicle speed when all conditions of the diagnosis condition and above condition a-1 to a-2 are met: Less than 15 km/h (9 MPH)

  2. After the above condition "1" is satisfied:

    • Instruction pressure of secondary pressure - Actuatl secondary pressure: 1.2 MPa or more
Diagnosis delay time Maintained for 10 seconds or more
3 Diagnosis condition

When all of the following conditions are satisfied:

  • DTC other than the applicable DTC is not detected.

  • Engine speed: More than 625 rpm

  • Shift position: Other than P/N position

  • CVT fluid temperature: More than -20°C (-4°F)

  • TCM power supply: More than 11 V

  • The difference between instruction pressure of secondary pressure and 10-msec-ago instruction secondary pressure is 0 MPa or more

  • Instruction pressure of secondary pressure: 0 MPa or more
Signal —
Threshold

  1. When all of the following condition b-1 to b-3 are satisfied and this state is maintained for 1 second:

    • b-1. Instruction pressure of secondary pressure - Actual secondary pressure: 0.25 MPa or more

    • b-2. Actual secondary pressure - low limit of oil level: Less than 0 MPa

    • b-3. MIN ( Minimum necessary oil pressure - Actual secondary pressure, Target secondary pressure - Actual secondary pressure ): 2 MPa or more

  2. After the above condition "1" is satisfied:

    • Instruction pressure of secondary pressure - Actuatl secondary pressure: 1.2 MPa or more
Diagnosis delay time Maintained for 10 seconds or more
 
 
 

POSSIBLE CAUSE

  • Secondary pressure solenoid valve (Control valve)

  • CVT chain

FAIL-SAFE

  • When a malfunction occurs on the low oil pressure side

    • Selector shock is large

    • Start is slow

    • Acceleration is slow

    • Lock-up is not performed

    • Nissan Murano Vehicle speed is not increased

  • When a malfunction occurs on the high oil pressure side

    • Selector shock is large

    • Start is slow

    • Acceleration is slow

    • Lock-up is not performed

DTC Confirmation Procedure

CAUTION:

Always drive vehicle at a safe speed.

The MIL is ON and ONLY DTC P0776 (PC SOLENOID B - Pressure Control Solenoid “B” Performance/Stuck OFF) is stored in the TCM.

NOTE:

If this issue should occur, the vehicle may hesitate and/or have a lack of power.

CHECK DTC PRIORITY

When DTC P0776 is displayed together with P17F0, diagnose first the P17F0.

Is "P17F0" detected?

YES>>

Perform diagnosis of P17F0. Refer to Diagnosis Procedure.

NO>>

GO TO 2.

PREPARATION BEFORE WORK

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

>>

GO TO 3.

CHECK DTC DETECTION

  1. Start the engine.

  2. Drive the Nissan Murano vehicle.

  3. Maintain the following condition for 20 seconds or more.

    Selector lever : “D” position
    Nissan Murano Vehicle speed : 40 km/h (25 MPH) or more
    Accelerator pedal position : 1.0/8 or more

  4. Stop the Nissan Murano vehicle.

  5. Check the first trip DTC.

Is “P0776” detected?

YES>>

Go to Diagnosis Procedure.

NO-1>>

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

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

INSPECT CVT CHAIN

Inspect the CVT chain. Refer to Component Inspection.

Is CVT chain OK?

YES>>

GO TO 2.

NO>>

GO TO 3.

INSTALL NEW CONTROL VALVE

Install new control valve. Refer to Removal and Installation.

>>

WORK END

REPLACE SUB-ASSEMBLY AND INSTALL NEW CONTROL VALVE

Replace sub-assembly and install new control valve. Refer to Disassembly & Assembly.

>>

WORK END

Component Inspection

CVT CHAIN BELT INSPECTION

CAUTION:

Never allow any chemicals or fluids other than NS-3 CVT fluid or equivalent to enter the CVT assembly. Never allow any foreign debris, dust, dirt, etc. to enter the CVT assembly.

NOTE:

Before lifting the vehicle:

  • Place the transmission gear selector in Neutral.

  • Leave the driver door unlatched.

  1. Remove the control valve. Refer to Removal and Installation.

  2. Secure the right front tire with a suitable strap . This will assist in making the chain belt turn.

  3. Mark the left front tire with a suitable marking. This will ensure all 360° of the chain belt is inspected.

  4. Using borescope J-51951 with mirror attachment, visually inspect the entirety of the two sides of the chain belt that come in contact with the pulleys . Slowly and carefully turn the left front tire one full turn in the forward rotation to view all of the chain belt.

    Guide rail
    : Front

    CAUTION:

    If the tire is rotated in the rearward rotation, the camera lens may get caught between the chain belt and the pulley.

    NOTE:

    • Be sure to remove the protective film from the mirror before the first use.

    • Clean the camera lens and mirror before each inspection. Use 90% isopropyl alcohol, and a lens swab from Lens Swab packet J-51963.

    • Before inspecting, make sure the camera handle’s AA batteries are fresh and the LCD monitor’s battery is charged.

    1. Route the camera cable past the primary pulley and position the camera lens behind the plastic guide. See figure below.

      NOTE:

      For best picture, position camera lens 10mm away from chain belt.

      Chain belt Camera cable Secondary pulley
      Plastic guide Primary pulley : Front

    2. First inspect the entire 360° of the driver side of the chain belt that comes in contact with the pulley. Refer to figures below for examples of normal and excessive wear patterns.

      Pulley
      Guide rail
      Camera flexible tube
      Chain belt

      NOTE:

      • Insert the camera lens behind the pulley past the guide rail and between the chain belt and the CVT case.

      • Insert the lens approximately 8-9 inches, and then view the side of the chain belt that contacts the pulley.

      • Holding the borescope with one hand allows for turning the tire with the other hand.

    3. If the inspection result is OK on all 360° of the driver side, inspect all 360° of the passenger side of the chain belt. Refer to figures below for examples of normal and excessive wear patterns.

      Chain belt
      Pulley
      Camera flexible tube
      Guide rail

CHAIN BELT WEAR PATTERNS

Examples of OK (normal) wear patterns.

  • Chain contact surfaces appear smooth.

Examples of NG (abnormal) wear patterns.

  • Chain contact surfaces show visible scuffing.

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