Refer to "Shop Manual" and remove necessary parts to get access to Cluster, ACU, ECM and other control units that connected to C-CAN Communication circuit.

Connect GDS to Data Link Connector (DLC).

Ignition "ON"

Disconnect unit connector one after the other.

Check for control unit causing the fault by communicating with Cluster, ACU, ECM and other systems with GDS.

Does the status of DTC U000100 changes to "History" when certain control module connector is disconnected?

	▶ Carefully re-do this troubleshooting guide steps. ▶ If problem still occurs, replace control unit that casuing the fault and then go to "Verification of Vechicle Repair" procedure.
	▶ Carefully re-do this troubleshooting guide steps. ▶ If problem still occurs, replace ECM and then go to "Verification of Vechicle Repair" procedure.