P0776

DTC P0776: Abnormality in Secondary Pressure Solenoid Valve Function

DIAGNOSTIC FUNCTION
TCM 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 (174 psi) or more.

PROBABLE CAUSES
^ Trouble in CAN bus system
^ Abnormal line pressure
^ Malfunction of TCM

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?
YES: Go to Step 2.
NO: Repair the CAN bus lines.

STEP 2. Check other diagnosis codes.

Q: Are other diagnosis codes set?
YES: Carry out the appropriate troubleshooting.
NO: Go to Step 3.

STEP 3. M.U.T.-III data list
Item 19: Secondary pressure (Refer to Data List Reference Table.) Data List Reference Table

Q: Is the check result normal?
YES: Intermittent malfunction
NO: Go to Step 4.

STEP 4. Line Pressure Check
Carry out "hydraulic test". Component Tests and General Diagnostics

Q: Is the check result normal?
YES: Go to Step 5.
NO: Repair according to the hydraulic pressure test diagnosis table.

STEP 5. Symptom recheck after erasing diagnosis code

Q: Is the check result normal?
YES: Intermittent malfunction
NO: Replace TCM.