On Board Diagnostic Tests

A diagnostic test is a series of steps with a beginning and an end. Diagnostic tests result in a pass or a fail, which is reported to the diagnostic executive. When a diagnostic test reports a pass result, the diagnostic executive records the following data:
^ The diagnostic test has been completed since the last ignition cycle.
^ The diagnostic test has passed during the current ignition cycle.
^ The fault identified by the diagnostic test is not currently active.

When a diagnostic test reports a fail result, the diagnostic executive records the following data:
^ The diagnostic test that has been completed since the last ignition
^ The fault identified by the diagnostic test is currently active
^ The fault that has been active during this ignition cycle
^ The operating conditions at the time of the failure