CAN COMMUNICATION SYSTEM PROBLEM SYMPTOMS TABLE

Tech Tips

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Result of CAN V Bus Check
Symptom	Suspected Area	See page
Open in CAN Main Wire	CAN Main Bus Line	Click here
Short in CAN Bus Lines	CAN Bus Line	Click here
Short to B+ in CAN Bus Line	CAN Bus Line	Click here
Short to GND in CAN Bus Line	CAN Bus Line	Click here
Open in One Side of CAN Branch Line	CAN Branch Line	Click here
Check Sub Bus Wire Harness	Sub Bus Line	Click here

Tech Tips

Refer to How to Proceed with Troubleshooting for the CAN V bus check procedure.

Communication Stop Mode Table
Symptom	Suspected Area	See page
"Skid Control (ABS/VSC/TRAC)" is not displayed on the intelligent tester	Brake Actuator (Skid Control ECU) Communication Stop Mode	Click here
"ECM (Engine)" is not displayed on the intelligent tester	ECM Communication Stop Mode	Click here
"Electric Vehicle Control" is not displayed on the intelligent tester	Electric Vehicle Control ECU Communication Stop Mode	Click here
"Airbag" is not displayed on the intelligent tester	Center Airbag Sensor Communication Stop Mode	Click here