. OPERATION DETAILED CONTROLS AND GAUGES Basic Operation of Machine Monitor If There Is Abnormality When Starting Engine screen. screen. 3 - 6 If there is an y abnormality when starting the engine, th e check before starting screen changes to t he maintenance een, warning screen, or an error screen. After display ing the check before starting screen for 2 seconds, the screen changes to the maint enance warning After display ing the maintenance warning screen for 30 seconds, the screen returns to the nor After display ing the check before starting screen for 2 seconds, the screen changes to the warnin g screen or error