The EBTCM contains sophisticated on-board diagnostics, that when accessed with a scan tool, is designed to identify the source of any system malfunction as specifically as possible, including whether or not the malfunction is intermittent.

When using the scan tool the last diagnostic trouble code is specifically identified. When using the scan tool specific data is stored at the time of the malfunction. The use of the scan tool monitors each input and each output enabling malfunction confirmation and repair verification. Manual control of components are available when using the scan tool. Automated functional tests are available when using the scan tool.