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DTC U1172: BMU LIN Checksum error
 
 
cautionWhenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets DTC U1172 when it cannot communicate with the battery management unit (BMU) via LIN correctly.
 
 
 
PROBABLE CAUSES
  • Malfunction of the battery management unit (BMU).
  • Malfunction of the PHEV-ECU.
  • Noise interruption in LIN bus wires.
 
 
 
 
DIAGNOSIS
Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ).
The trouble can be an intermittent malfunction (Contact failure of connector and semi-break of harness on LIN bus line between PHEV-ECU and BMU) (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).