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DTC U1926: EV-CAN Error (Master ECU)
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
TROUBLE JUDGMENT
Check Condition
  • The electric motor switch is turned ON, or the main drive lithium-ion battery starts to be charged.
Judgment Criterion
  • When either one of the following DTCs is set in the PHEV-ECU
    1. U0111: BMU Timeout
    2. U1074: EV CAN/2nd CAN Bus-off
 
 
 
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 battery management unit (BMU) is failed.
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
Use the scan tool (M.U.T.-IIISE) to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair CAN bus line (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnostics Table ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the DTC is set.
Confirm whether the DTC are set in PHEV-ECU.
Is the DTC set?
Perform the troubleshooting of the PHEV-ECU (Refer to GROUP 54Da - Diagnostic Trouble Code Chart ).
Go to Step 3.
 
STEP 3. 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 battery management unit (BMU) (Refer to ).
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 ).