Code No. P1AA7: PHEV-ECU Signal Time-out




TROUBLE JUDGEMENT


Check Condition
  • The power supply mode of the electric motor switch is ON, or the drive battery starts to be charged.
Judgement Criterion
  • The signal sent by the PHEV-ECU through the CAN cannot be received.

FAIL-SAFE AND BACKUP FUNCTION



  • When the backup communication is normal, use the backup communication data.

PROBABLE CAUSES



  • The CAN bus is failed.
  • The PHEV-ECU is failed.
  • The BMU is failed.

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnosis



  • Using M.U.T.-III, perform CAN bus line diagnosis.

Q. Is the check result normal?

Go to Step 2.
Repair CAN bus line (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnostics Table ).

STEP 2. M.U.T.-III other system diagnosis code.



  • Check that the diagnosis code is stored in the PHEV-ECU.

Q. Is diagnosis code related to the PHEV-ECU system stored?

Check PHEV-ECU system (Refer to ).
Go to Step 3.

STEP 3. M.U.T.-III diagnosis code


Q. Is any other diagnosis code than P1AA7 stored?

Inspection chart for diagnosis codes (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).