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 has been completed since the last ignition.
^ The fault identified by the diagnostic test is currently active.
^ The fault has been active during this ignition cycle.
^ The operating conditions at the time of the failure