DTC No. U1D42-87 OBC CAN IF or BMU failure

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC set in memory for the item monitored below)

On Board Charger (OBC) monitor
EV CAN monitor

Sensor (The sensor below is determined to be normal)

Not applicable

DTC SET CONDITIONS

Logic Flow Chart

Check Condition

The On Board Charger (OBC)/DC-DC converter power supply voltage is 10.0 to 16.0 volts.

Judgment Criterion

The communication status between the On Board Charger (OBC)/DC-DC converter and Battery Management Unit (BMU) is in Fail condition for 2 seconds or more.

OBD-II DRIVE CYCLE PATTERN

Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.

TROUBLESHOOTING HINTS

Malfunction of the CAN bus line
Malfunction of the BMU power supply circuit
Malfunction of the BMU
Malfunction of the On Board Charger (OBC)/DC-DC converter

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.Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE

(2) Check the DTC.

Is the DTC set?

Diagnose the CAN bus line (Refer to CAN Fundamental - Trouble Diagnosis Flow Chart Trouble Diagnosis Flow Chart

). Then,

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

2.Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE

(2) Check the DTC.

Is the DTC set?

Retry the troubleshooting.

The procedure is complete.