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DTC No. U23A1-87 Lost Communication With RMCU
 
 
 
 
DTC SET CONDITION
Check Condition
  • The power supply mode of the electric motor switch is ON.
Judgment Criterion
  • The CAN signal from the REMCU can not be received for 2 seconds or more.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the CAN bus line (EV CAN)
  • Malfunction of the REMCU power supply circuit
  • Malfunction of the REMCU
  • 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.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).