DTC P0776: Pressure Control Solenoid "B" Performance/Stuck Off: Notes

1. - 

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

• Engine speed increases abruptly, and cannot accelerate.
• Excessive slippage is felt.

Wiring diagram: 

CVT control system Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>CVT CONTROL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .

   Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Besides DTC P0776, is any of the DTC P0717, P0966, P0967 or P2747 displayed?

   Yes  : Perform the diagnosis according to DTCs other than P0776. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No  : Go to  2.

2. CHECK F & R SOLENOID (ACTIVE TEST)  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, perform the active test for F & R solenoid. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>ACTIVE TEST .

   Does the indication of 0 - 500 mA appear repeatedly during the active test, and does operating sound emit during indicating 500 mA?

   Yes  : Go to  5.

   No  : Go to  3.

3. CHECK F & R SOLENOID  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the TCM connector.
   3. Measure the resistance between TCM connector and transmission body.

      Connector & terminal 

      (T10) No. 16 - Transmission body:

   Is the resistance approximately 3.3 - 7.3 Ω? (When cold)

   Yes  : Go to  7.

   No  : Go to  4.

4. CHECK HARNESS  .

   Check the transmission harness. (Open circuit, short circuit to power supply, short circuit to ground, and poor contact)

   Is the check result OK?

   Yes  : Go to  7.

   No  : Repair the harness.

5. CHECK TRANSMISSION FLUID  .
   1. Connect the TCM connector.
   2. Check the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>CVTF>INSPECTION .

   Is the check result OK?

   Yes  : Go to  6.

   No  : Adjust the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>CVTF>INSPECTION .

6. CHECK TRANSMISSION FLUID  .

   Check the condition of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>CVTF>REPLACEMENT .

   Is the check result OK?

   Yes  : Return ATF. Go to  7.

   No  : Check according to the "Corrective action" of ATF (CVTF) "CONDITION CHECK". Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>CVTF>REPLACEMENT .

7. CHECK INPUT SIGNAL FOR TCM  .
   1. Start the engine.
   2. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F).
   3. Set the select lever to "D" range.
   4. Drive at 2 km/h or more.
   5. Shift the select lever to "P" range.
   6. Stabilize the engine speed at idle.
   7. Using the Subaru Select Monitor, read data of [Actual line press.] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>DATA MONITOR .

   Is [Actual line press.] 0.5 - 1.5 [MPa]?

   Yes  : Go to  8.

   No  : Perform the diagnosis according to DTC P0841. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P0841 TRANSMISSION FLUID PRESSURE SENSOR/SWITCH "A" CIRCUIT RANGE/PERFORMANCE .

8. STALL TEST  .

   Perform the stall test. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>STALL TEST .

   Is the result of the stall test OK?

   Yes  : Go to  9.

   No  : Replace the transmission assembly if the stall speed is higher than the standard value of the stall test. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>TRANSMISSION ASSEMBLY .

9. DRIVING CHECK BY INSPECTION MODE  .
   1. Using the Subaru Select Monitor, perform the clear memory of [Transmission]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   2. Execute the inspection mode. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>INSPECTION MODE .

   Does the AT OIL TEMP light blink and is DTC P0776 displayed?

   Yes  : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>TRANSMISSION ASSEMBLY .

   No  : Current condition is normal. It is possible that temporary poor contact occurs.