How to use Communication Test

Table of Contents

How to use Communication Test

Start communication test
Start continuous communication test
Detected circuit pins
Communication test results

The test can only be run when the paired VOCOM II device is not in use by any diagnostic application. To run the test, click on the “start communication test” button. The test result will be displayed immediately after the test is complete.
- Note: You cannot use the diagnostic application when the test is running continuously.
The VOCOM II Communication Test is available in Configurator from version 4.7.0 or newer and is applicable for the VOCOM II Tough and VOCOM II Mini devices.
The Communication Test is used to confirm if it is possible to communicate with the control units, via the VOCOM II device and the OBD cable/connector.
The Communication Test shows the status of the data links that are found in the current connected vehicle/equipment, but the test cannot show which data links that are expected to respond
The technician needs to know what data links that are expected for the connected vehicle/equipment, see Electrical architectures and data links.

Communication test results

If the Communication Test shows that communication is not possible in any or all of the expected data link(s), it means that there is a problem with the OBD connection. The diagnostic application will either not be able to identify the vehicle/equipment, or mismatches/errors will occur.

If the Communication Test is successful for the expected data links, it confirms that the communication is working. If there is a problem to identify the vehicle/equipment, troubleshooting must be done in the diagnostic application.

Detected circuits

In the Communication Test, the OBD connector image displays the pins as they are seen in the vehicle/equipment connector.

When the test is run, the detected pins will be colored.

Battery voltage – Pin 16

Battery voltage must always be present (12 V or 24 V).

Ignition voltage – Pin 1

Ignition voltage must be present when J1708 is present, and its level shall be close to the battery voltage level.

Ethernet activation line voltage – Pin 8

Ethernet activation line voltage must be present for vehicles that have ethernet capability, and its level shall be around 75% of the battery voltage.

Electrical architectures and data links

	Data links
Electrical architecture	J1708*	CAN1	CAN2	Ethernet**
VERSION2	X
VERSION3	X	X
VERSION3 (North America)	X	X	X
VERSION4 T1		X
VERSION4 T2		X		X

* J1708

Pin 1 is expected to have voltage when J1708 data link is present.
The test can detect pin 1 voltage and J1708 traffic independently, but both are required to be present when using the diagnostic application.

** Ethernet

The voltage level in the activation line is used to determine the ethernet configuration.
The difference between Ethernet type A and B is simply which pins are used:
- Ethernet type A (pins 3, 11, 12 and 13).
- Ethernet type B (pins 1, 9, 12 and 13).
Volvo Group vehicles shall be detected as Ethernet type B.