Code No. P0776: Abnormality in Secondary Pressure Solenoid Valve Function




DIAGNOSTIC FUNCTION


CVT-ECU conducts fault detection by measuring the difference between the target value and the actual value for the secondary pressure.

JUDGEMENT CRITERIA


The following three conditions are met for three seconds.

  1. Engine speed is 450 r/min or more.
  2. Power supply voltage is 10 V or more.
  3. Difference between target secondary pressure and actual secondary pressure is 1.20 MPa for 3 seconds continuously.

PROBABLE CAUSES




DIAGNOSTIC PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics


Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?

Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Diagnosis Code Chart ).

STEP 2. Check other diagnosis codes.


Q. Are other diagnosis codes set?

Carry out the appropriate troubleshooting.
Go to Step 3.

STEP 3. M.U.T.-III data list


Item 19: Secondary pressure (Refer to Service Data Table .)

Q. Is the check result normal?

Intermittent malfunction
Go to Step 4.

STEP 4. Line Pressure Check


Carry out "hydraulic test"(Refer to ).

Q. Is the check result normal?

Go to Step 5.
Repair according to the hydraulic pressure diagnosis table.

STEP 5. Symptom recheck after erasing diagnosis code


Q. Is the check result normal?

Intermittent malfunction
Replace CVT-ECU.