Fault-tracing information

Condition

Fig 1: Identifying Scan Tool

Courtesy of VOLVO CARS OF NORTH AMERICA.

Possible Source

Poor battery voltage
Break, short-circuiting to ground or short-circuiting to power in the Data Link Connector cable
Break in the Data Link Connector voltage supply, power ground or signal ground
Defective Volvo System Tester, Volvo System Tester cabling or gear

NOTE:

If the communication problem only occurs when the engine is started, connect the battery charger or an extra battery