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DTC No. U1E08-87 Lost Communication with DC/DC Converter
 
 
 
 
DTC SET CONDITION
Check Condition
  • The power supply mode of the electric motor switch is ON (READY indicator: ON) or the drive battery is being charged.
Judgment Criterion
  • Malfunction on the CAN communication with the DC-DC converter is detected.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the CAN bus line (EV CAN)
  • Malfunction of the DC-DC converter
  • Malfunction of the PHEV-ECU
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.M.U.T.-IIISE other system DTC
Check whether the DC-DC converter sets the DTC.
Is the DTC set?
Troubleshoot the set DTC (Refer to DIAGNOSTIC TROUBLE CODE CHART).
 
2.Check whether the DTC is set again.
(1) Erase the set DTC.
(2) Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
(3) Check whether the DTC is set again.
Is the DTC set?
Diagnose the CAN bus line (Refer to CAN Fundamental - Trouble Diagnosis Flow Chart Trouble Diagnosis Flow Chart).
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).