Electronically controlled EGR system tester for GM Linear and Digital EGR systems. - Expanded coverage for foreign and domestic applications is available with the Waekon 47001 adapter kit (not included). No faster wayto pinpoint intermittent feedback sensors and EGR valves, NOx failures or enginer performance problems. Checks vacuum control solenoids, vacuum lines and EGR passages. Identifies intermittent problems that alternative methods including scan tools can't. Duty Cycle - complete control over valve opening. Find intermittent sticking or improperly seating EGR valves. Feedback Sensor Display - feedback sensor voltage over the full range of EGR valve motion. Solenoid Status LEDs - indicates energized, short, open. Kit includes: EGR tester unit, 2 adapter cables for GM Linear and Digital valves, comprehensive instruction/diagnostic manual, zippered storage case.