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 volts 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 CAN Bus Diagnostics Chart).
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"(Refer to Hydraulic Pressure Test).

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.