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DTC No. U2144-87 CAN comm err (BMU) ch1
 
 
 
 
DTC SET CONDITION
Check Condition
  • The power supply mode of the electric motor switch is ON (READY indicator: ON).
Judgment Criterion
  • The CAN signal from the BMU can not be received for 2 seconds or more.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the CAN bus line (EV CAN)
  • Malfunction of the BMU power supply circuit
  • Malfunction of the drive battery (malfunction of the BMU)
  • Malfunction of the power drive unit
 
 
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 DTC check
Check whether the DTC, which has the higher priority than this DTC, is set. (Refer to DTC Inspection Priority Chart).
Is the DTC set?
Troubleshoot the set DTC (Refer to DIAGNOSTIC TROUBLE CODE CHART).
 
2.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).