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.
Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

Result List of How to Proceed with Troubleshooting
Symptom	Suspected Area	See page
The result of "How to Proceed with Troubleshooting" is "Open in CAN Main Bus Line".	Open in CAN Main Bus Line (Includes DLC3 branch lines and terminating resistors)	Click here
The result of "How to Proceed with Troubleshooting" is "Short in CAN Bus Lines".	Short in CAN Bus Lines	Click here
The result of "How to Proceed with Troubleshooting" is "Short to B+ in CAN Bus Line".	Short to +B in CAN Bus Line	Click here
The result of "How to Proceed with Troubleshooting" is "Short to GND in CAN Bus Line".	Short to GND in CAN Bus Line	Click here
The result of "How to Proceed with Troubleshooting" is "Open in One Side of CAN Branch Line".	Open in One Side of CAN Branch Line	Click here

Tech Tips

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

Communication Stop Mode Table.
The suspected communication stop area can be determined based on the ECU or sensor that was not displayed on the CAN Bus Check screen and by referring to the table below.
Symptom	Suspected Area	See page
"Skid Control (ABS/VSC/TRAC)" is not displayed on the Techstream.	Skid Control ECU Communication Stop Mode	Click here
"Power Steering (EPS)" is not displayed on the Techstream.	Power Steering ECU Communication Stop Mode	Click here
"Spiral cable (Steering Angle Sensor)" is not displayed on the Techstream.	Steering Angle Sensor Communication Stop Mode	Click here
"CAN Gateway1" is not displayed on the Techstream.	Gateway ECU Communication Stop Mode	Click here
"ECM (Engine)" is not displayed on the Techstream.	ECM Communication Stop Mode	Click here
"Air Conditioning Amplifier" is not displayed on the Techstream.	Air Conditioner Amplifier Communication Stop Mode	Click here
"Main Body" is not displayed on the Techstream.	Main Body ECU Communication Stop Mode	Click here
"Clearance Warning (Intuitive Parking Assist2)" are not displayed on the Techstream.	Clearance Warning ECU Communication Stop Mode	Click here
"Combination Meter" is not displayed on the Techstream.	Combination Meter ECU Communication Stop Mode	Click here
"Certification (Smart)" is not displayed on the Techstream.	Certification ECU Communication Stop Mode	Click here
"Airbag" is not displayed on the Techstream.	Center Airbag Sensor Communication Stop Mode	Click here
"Display and Navigation (AVN1)" is not displayed on the Techstream.	Navigation ECU Communication Stop Mode	Click here
"Display and Navigation (AVN1)" is not displayed on the Techstream.	Audio Receiver Assembly Communication Stop Mode	Click here

DTC Combination Table
Symptom	Suspected Area	See page
Although CAN communication (V bus) is currently normal, ECUs connected to the V bus store CAN communication DTCs.	The probable part for which communication is interrupted can be determined using DTC Combination Table and comparing the DTCs output from ECUs connected to the CAN communication system	Click here