[Previous][Next]
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.
 
 
JUDGMENT 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. Using scan tool MB991958, diagnose the CAN bus line.
Use scan tool MB991958 to perform the CAN bus diagnosis.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Diagnostic Trouble Code Chart ).
 
STEP 2. Check other diagnostic trouble codes.
Are other diagnostic trouble codes set?
Carry out the appropriate troubleshooting.
Go to Step 3.
 
STEP 3. Scan tool data list
Item 19: Secondary pressure (Refer to Data List Reference Table .)
Is the check result normal?
Intermittent malfunction
Go to Step 4.
 
STEP 4. Line Pressure Check
Carry out "hydraulic test"(Refer to ).
Is the check result normal?
Go to Step 5.
Repair according to the hydraulic pressure test diagnostic trouble table.
 
STEP 5. Symptom recheck after erasing diagnostic trouble code
Is the check result normal?
Intermittent malfunction
Replace TCM.