Diagnostics And Services: Notes

Fig 1: Control Module And Diagnostics Tool

Courtesy of VOLVO CARS OF NORTH AMERICA.

The control module's diagnostics can perform and present the following using a connected diagnostics tool:

Store malfunction indicator (diagnostic trouble codes) and in certain cases activate warning light or show text message.
- Counter that indicates how frequent the malfunction is
- Status indicators for the diagnostic trouble code test.
- Frozen values that were generated when malfunction was detected for the first time.
Store information about the nature of the malfunction:
- Counter that indicates how frequent the malfunction is
- Status indicators for the diagnostic trouble code test.
- Frozen values that were generated when malfunction was detected for the first time.
Erase information about malfunction and its information.
Present values (parameters) for different connected input signals and output signals from, e. g., components as well as other calculated values.
Present part number, version number, component number, etc. for both software and hardware.
Present and change certain special customer settings and configurations.
Trigger/control (activate) the connected output signals.
Start special built-in check programs/tester such as, e. g., calibrations of gear position sensor, quick-test of tank system.
Access check to limit access to certain parameters and functions. Accessible first after unlocking with, e. g., PIN-code.

Exactly what each control module's diagnostics can perform depends both on model year and system.