Abstract: Methods and apparatus for testing operation and diagnosing faults in an engine including an electronic control unit. A diagnostic computer is coupled to the electronic control unit and displays engine testing and diagnostic text messages in any one of a plurality of selectable languages, energize ignition circuits on demand, display menu screen displays associated with engine testing, diagnostics and service, and generate summary screen displays and reports for later use.

Abstract: A stern drive system having an outdrive generally disposed downstream relative to water flow aft a transom of the boat is configured to be rotated about a generally horizontal axis to impart a desired trim or tilt to the drive system. A tilt-trim subsystem assembly is affixed to the outdrive and has one respective end thereof configured to pivotally receive an anchor pin supported by the outdrive. The assembly includes at least one cylinder having one end thereof connected to another anchor pin so that when the cylinder is actuated by a circuit therein the outdrive and the tilt subsystem assembly are rotated about the generally horizontal axis during tilt maneuvers. A housing is provided to shield the tilt assembly and configured within the footprint of the outdrive to avoid resistance to water flow. Additionally, the housing may be configured to visually shield the tilt assembly from observers.