Code No. U1010 PHEV ECU Parity/Toggle bit error



caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • If diagnosis code No.U1010 is stored in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be stored. In this case, the stored diagnosis code is not highly reliable.
  • Before replacing the ECU, ensure that the communication circuit is normal.

OPERATION


PHEV-related signals are sent or received to and from between ASC-ECU and PHEV-ECU via CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS


This diagnosis code is stored when the PHEV-ECU malfunction has been detected.

PROBABLE CAUSES



  • Malfunction of PHEV-ECU
  • Malfunction of ASC-ECU
  • External noise interference

DIAGNOSIS PROCEDURE


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


Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 5.

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


Use M.U.T.-III to check that any diagnosis code other than code No.U1010 is stored in ASC-ECU.

Q. Is the diagnosis code stored?

Troubleshoot the relevant diagnosis code, and then go to Step 5.
Go to Step 3

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


Use M.U.T.-III to check whether the diagnosis code is stored in the PHEV-ECU.

Q. Is the diagnosis code stored?

Troubleshoot the relevant diagnosis code, and then go to Step 5.
Go to Step 4

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


Erase the diagnosis code.

Q. Is diagnosis code No.U1010 stored?

Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ), and then go to Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 5. Check whether the diagnosis code is stored again.


Erase the diagnosis code.

Q. Is diagnosis code No.U1010 stored?

Return to Step 1.
This diagnosis is complete.