[Previous][Next]
DTC U0001: Malfunction of CAN Communication Circuit
 
 
 
 
DIAGNOSTIC FUNCTION
The TCM determines that the system is defective if CAN communication information cannot be sent or received.
 
 
DESCRIPTIONS OF MONITOR METHODS
  • TCM cannot receive the periodic communication data.
 
 
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)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
LOGIC FLOW CHARTS (Monitor Sequence)
 
 
DTC SET CONDITIONS
Check Conditions
  • Time after TCM start: more than 0.7 seconds.
  • Voltage of battery: 10 volts or more
  • Voltage of battery: 16.5 volts or less
Judgment Criteria
  • CAN communication: fail (Bus-off error is detected)
 
 
OBD-II DRIVE CYCLE PATTERN
Ignition switch: "ON" position (start the engine and keep it for 10 seconds or more)
 
 
PROBABLE CAUSES
  • Malfunction of the CAN bus line
 
 
DIAGNOSIS
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to perform the CAN bus diagnosis.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C, Troubleshooting - Diagnostic Trouble Code Chart ).
 
STEP 2. Symptom recheck after erasing diagnostic trouble code
Is the diagnostic trouble code stored?
Replace the TCM.
Intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunctions .).