Many malfunctions in the electrical system are caused by poor harness and terminals.

Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage

Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.

Has a problem been found ?

	▶ Go to "CAN communication circuit inspection" procedure.
	▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Connect all kinds of modules related to CAN communication.

IG KEY "ON" or Engine "ON"

Measure signal waveform between terminal C-CAN-HIGH of cluster module harness connector and chassis ground.

Measure signal waveform between terminal C-CAN-LOW of cluster module harness connector and chassis ground.

Are the measured signal waveforms OK?

	▶ Go to next procedure.
	▶ Check for open or short in the circuit. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Ignition "OFF"

Disconnect EPS(MDPS)ECU connector and TCU connector

Measure the resistance between CAN-HIGH terminal of EPS(MDPS)ECU harness connector and CAN-HIGH terminal of TCU harness connector.

Measure the resistance between CAN-LOW terminal of EPS(MDPS)ECU harness connector and CAN-LOW terminal of TCU harness connector.

Is the measured resistance within specification ?

	▶ Check TCU and EPS(MDPS)ECU connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
	▶ If the measured value is ∞ Ω, repair or replace the open in CAN High /CAN Low circuit. And then, go to 'Verification of Vehicle Repair" procedure.

IG KEY OFF

Disconnect ECM/PCM connector and Cluster connector.

Measure resistance between terminal CAN Low and CAN High of ECM/PCM.

Is the measured value within specification ?

	▶ If the measured value is out of specification, repair or replace 120Ω CAN register(Inside of ECM/PCM and Cluster) and then, go to "Verification of Vehicle Repair" procedure. ▶ If the measured value is ∞ Ω, repair or replace the open in CAN High /CAN Low circuit. And then, go to 'Verification of Vehicle Repair" procedure. ▶ Go to next procedure.
	▶ Substitute with a known-good "ECM/PCM, CLUSTER" and check for proper operation. If the problem is corrected, replace "ECM/PCM, CLUSTER" and then go to "Verification of Vehicle Repair" procedure.