CVT

DTC U0100: CAN Time-out Error (Engine)

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

JUDGEMENT CRITERIA
TCM cannot receive the periodic communication data from the ECM.

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

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)
^ 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)

Logic Flow Charts (Monitor Sequence):

DTC SET CONDITIONS

Check Conditions
^ TCM is started: more than 1.05 seconds.

Judgement Criteria
^ CAN communication with ECM: fail. (0.5 second)

OBD-II DRIVE CYCLE PATTERN
All the conditions below continue for 21 seconds.
^ CAN reception is normal.
^ CAN bus diagnosis is possible.

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.

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.