Code No. U1945: LIN (EV-CAN back up) No Bus Activity




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 communication is not available for a certain period, or a short circuit to earth of EV-LIN bus

FAIL-SAFE AND BACKUP FUNCTION



  • Not available

PROBABLE CAUSES



  • The harnesses and connectors are failed.
  • The BMU is failed.

DIAGNOSIS PROCEDURE


STEP 1. 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 2.

STEP 2. Check of short to earth, open circuit and damage in LIN1 line between BMU connector and PHEV-ECU connector.


Q. Is the check result normal?

Go to Step 3.
Repair the connector(s) or wiring harness.

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



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code stored?

Replace the BMU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).