Code No. P0768: High Clutch Linear Solenoid Valve System


LINE PRESSURE LINEAR SOLENOID VALVE SYSTEM CIRCUIT


Refer to .

DIAGNOSIS CODE SET CONDITIONS


During 1st to 3rd gear driving, an abnormal value equivalent to open or short circuit is detected in the solenoid control current for 5 seconds.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Check the A/T-ECU terminal voltage.
[C-138 A/T-ECU connector (vehicle side, connected)]
Measure the voltage between the terminal No. 1 and body earth.

  • High clutch engaged: 0 V
  • Other than above: 300 Hz

Q. Is the check result normal?
Go to Step 5.
Go to Step 2.

STEP 2. Check between the A/T-ECU connector and A/T control solenoid valve assembly connector.
Check for continuity between C-138 A/T-ECU connector and B-132 A/T control solenoid valve assembly connector.

  • Between C-138 terminal No. 1 and B-132 terminal No. 19: Continuity exists.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.

Q. Is the check result normal?
Go to Step 3.
Repair or replace the failure section.

STEP 3. Check the high clutch linear solenoid.
Refer to .

Q. Is the check result normal?
Go to Step 6.
Go to Step 4.

STEP 4. Check between the A/T control solenoid valve assembly connector and the high clutch linear solenoid valve connector.
Check for continuity between the A/T control solenoid valve assembly connector terminals and the high clutch linear solenoid valve connector terminals.

  • Between B-132 terminal No. 19 and high clutch linear solenoid valve: Continuity exists.

Q. Is the check result satisfactory?
Replace the valve body assembly.
Repair or replace the failure section.

STEP 5. Check the A/T-ECU and A/T control solenoid valve assembly connector pin terminals and the connection status.

Q. Is the check result normal?
Go to Step 7.
Repair or replace the failure section.

STEP 6. Check the A/T-ECU and A/T control solenoid valve assembly connector pin terminals and the connection status.

Q. Is the check result normal?
Replace the A/T-ECU.
Repair or replace the failure section.

STEP 7. Erase the diagnosis code, and drive the vehicle for a while.
Check that the normal code is displayed.

Q. Is the check result normal?
The procedure is complete.
Return to START.