Operates injectors individually to diagnose fuel delivery problems on petrol vehicles with electronic fuel injection. Works with engine off & pulse timer may be used with fuel pressure gauge. Powered by vehicle’s 12V battery. Can be used to locate fuel system faults such as: • Clogged or leaking fuel injectors. • Sluggish or sticky fuel injectors. • Wiring harness faults. • Fuel injector driver signal faults.