Code No. U1926: PHEV-ECU CAN Abnormal




TROUBLE JUDGEMENT


Check Condition
  • The electric motor switch is turned ON, or the drive battery starts to be charged.
Judgement Criterion
  • When either one of the following diagnosis codes is stored in the PHEV-ECU

  1. U1073: BUS OFF
  2. U0111: BMU Time-out

FAIL-SAFE AND BACKUP FUNCTION



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

PROBABLE CAUSE



  • The PHEV-ECU is failed.
  • The harnesses and the connectors of the CAN bus.
  • 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 ). After repairing CAN bus line, go to Step 4.

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



  • Confirm whether the diagnosis codes are stored in PHEV-ECU.

Q. Is the diagnosis code stored?

Perform the troubleshooting of the PHEV-ECU (Refer to ).
Go to Step 3.

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


Reconfirm whether the diagnosis codes are stored in BMU.

  1. Erase the stored diagnosis codes.
  2. Without depressing the brake pedal, operate the electric motor switch with the power supply mode of the electric motor switch OFF to turn ON the power supply mode of the electric motor switch.
  3. Confirm whether the diagnosis codes are stored.

Q. Is the diagnosis code stored?

Replace the BMU. Then go to Step 4.
Intermittent malfunction in CAN bus line between BMU and PHEV-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 4. M.U.T.-III diagnosis code


Reconfirm whether the diagnosis codes are stored in BMU.

  1. Erase the stored diagnosis codes.
  2. Without depressing the brake pedal, operate the electric motor switch with the power supply mode of the electric motor switch OFF to turn ON the power supply mode of the electric motor switch.
  3. Confirm whether the diagnosis codes are stored.

Q. Is the diagnosis code stored?

Go to Step 1.
Check end.