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DTC U11AE, U11AF, U11B0, U11B1, U11B2, U11B3, U11B4, U11B5, U11B6, U11B7: CMU CAN Timeout
 
 
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • EV-CAN monitor
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • BMU (SUB) power supply voltage is 8 volts to 16 volts.
  • Time after above conditions satisfy is more than 3 seconds.
Judgment Criterion
  • Unable to receive main drive lithium-ion battery sensor module signals through the CAN bus line for 1 second.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to OBD-II Drive Cycle - Pattern 1 .
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Not available
 
 
PROBABLE CAUSES
  • The harness and connector is failed.
  • CAN line harness damage or connector damage.
  • The module (CMU) in the main drive lithium-ion battery is failed.
  • The sub-battery management unit [BMU (SUB)] is failed.
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the BMU sets DTC P1AD3, P1AD4, P1AD5, P1AD6, P1AD7, P1AD9, P1ADA, P1ADB, P1ADC or P1ADD.
Is the DTC set?
Go to Step 2.
Remove the battery tray cover (Refer to ). Replace the sub-battery management unit [BMU (SUB)] (Refer to ). Then, assemble the main drive lithium-ion battery assembly (Refer to ). Then, go to Step 3.
 
STEP 2. Check of damage in IGCT, GND, CANH, CANL line between CMU connector and main drive lithium-ion battery connector.
(1) Remove the battery tray cover (Refer to ).
(2) Check the IGCT, GND, CANH, CANL line of the CMU corresponding to the DTC being set.
Is the check result normal?
Replace the module (CMU). Then, assemble the main drive lithium-ion battery assembly (Refer to ). Then, go to Step 3.
Repair the connector(s) or wiring harness. Then, assemble the main drive lithium-ion battery assembly (Refer to ). Then, go to Step 3.
 
STEP 3. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle - Pattern 1 .
(2) Check the DTC set.
Is the DTC set?
Retry the troubleshooting.
The inspection is complete.