Checking The Traffic Load On The Can Cables

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS CORPORATION

• Connect the battery.
• Ignition on.

  Faults in the CAN network may be due to a control module sending faulty messages that disrupt normal communication. When messages are sent incorrectly, this results in a considerable increase in the amount of traffic on the CAN network. Check the load by measuring the average voltage value on the CAN cables in relation to ground.

  Check as follows:

  • Connect a voltmeter between CAN-L and ground. The voltage should be approx: V
  • Connect a voltmeter between CAN-H and ground. The voltage should be approx: V

  Other information 

  • see BATTERY, DISCONNECTING

Is the value OK? 

• YES 

  Refer to INFORMATION 

• NO 

  Refer to IDENTIFYING A CONTROL MODULE IN THE CAN NETWORK