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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?

	Go to Step 2.

	Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Diagnosis Code Chart ).

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?

	Carry out the appropriate troubleshooting.

	Go to Step 3.

STEP 3. Symptom recheck after erasing diagnosis code

Q. Is the check result normal?

	Intermittent malfunction

	Replace TCM.