A diagnostic system for an engine is provided for which a plurality of annunciators are energized according to particular fault code sequences. A self-diagnosis mode is controlled by use of the vehicle throttle. The self-diagnosis mode can be initiated by a predetermined number of cycles of the vehicle...http://www.google.de/patents/US6112148?utm_source=gb-gplus-sharePatent US6112148 - System and method for controlling diagnostic annunciators
