Checking diagnostic trouble codes (DTCs)

NOTE:

The test cannot be started if diagnostic trouble codes (DTCs) are stored. Therefore it is important to check whether there are any diagnostic trouble codes (DTCs) stored.

Fig 1: Identifying Ignition Switch ON Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition on
Read off diagnostic trouble codes (DTCs)
If diagnostic trouble codes (DTCs) are stored the test must be halted and fault-tracing for diagnostic trouble codes (DTCs) must be carried out first.

Fig 2: Identifying VCT2000 Diagnostic Tool
Courtesy of VOLVO CARS OF NORTH AMERICA.

Are any diagnostic trouble codes (DTCs) stored?

YES
OKAY: Troubleshooting has been completed.
NO
Refer to Checking engine coolant temperature (ECT)