Code No. P1079: Generator drive voltage sensor fails (short to earth, open circuit)




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. CAN bus line check


Q. Is the check result normal?

Go to Step 2.

Repair the CAN bus line.

STEP 2. Use M.U.T.-III to confirm a diagnosis code of other systems


Check whether the other ECU stores a diagnosis code.

Q. Is diagnosis code stored?

Diagnose the system according to the stored diagnosis code.

Go to Step 3.

STEP 3. Check whether the diagnosis code is stored again.


Check whether the generator control unit stores a diagnosis code again.
(1)Erase the stored diagnosis code.
(2)Power supply mode of electric motor switch: OFF
(3)Power supply mode of electric motor switch: ON
(4)Check if the diagnosis code is stored.

Q. Is diagnosis code stored?

Replace the power drive unit. (Refer to .) Then go to Step 4.

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 4. Check whether the diagnosis code is stored again.


Check whether the generator control unit stores a diagnosis code again.
(1)Erase the stored diagnosis code.
(2)Power supply mode of electric motor switch: OFF
(3)Power supply mode of electric motor switch: ON
(4)Check if the diagnosis code is stored.

Q. Is diagnosis code stored?

Return to Step 1.

This diagnosis is complete.