CVT

DTC U0100: CAN Time-out Error (Engine)

DIAGNOSTIC FUNCTION
TCM receives periodic communication data from the ECM via CAN bus lines.

DESCRIPTIONS OF MONITOR METHODS
^ TCM cannot receive the periodic communication data from the ECM.

MONITOR EXECUTION
^ When 1.05 seconds have elapsed after TCM started

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ P0725: Malfunction of engine speed
^ P0868: Secondary pressure drop

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 1.05 seconds.
^ Voltage of battery: 9 volts or more
^ Voltage of battery: 16 volts or less

Judgment Criteria
^ CAN communication with ECM: fail. (500 millisecond)

OBD-II DRIVE CYCLE PATTERN
Ignition switch : ON (start the engine and keep it for 10 seconds or more)

PROBABLE CAUSES
^ Malfunction of the CAN bus
^ Engine ECU malfunction
^ Malfunction of TCM

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines (Refer to Troubleshooting Diagnosis Code Chart CAN Bus Diagnostics Table).

STEP 2. M.U.T.-III diagnosis code
Check if the engine-related diagnosis code is set.
Q: Is the engine-related diagnosis code set?
YES: Carry out the appropriate troubleshooting.
NO: Go to Step 3.

STEP 3. Symptom recheck after erasing diagnosis code
Q: Is the check result normal?
YES: Intermittent malfunction
NO: Replace TCM.