To check duty cycle, you need something that can measure time; a multimeter generally cannot do this. If you have an oscilloscope you can find out the duty cycle by measuring the time between open/closed. Best way is VAG-COM since you can get readings direct from the ECU, but maybe somebody can chime in with another alternative (I can't think of any).
2001.5 A4 1.8TQM: FrankenTurbo F21, Motoza E85/91 switchable tune, Bosch EV14 750cc injectors, I.E. rods, 3" MAF, 034 3" HFC, custom 2.5" exhaust, FMIC, Eibach Pro-Street coilovers, 034 rear sway bar, A8/TT front & S4 rear brakes & SS lines, JHM short shifter/linkage upgrades, ECS RA4 flywheel / B7 RS4 clutch, 4:1 diff mod, sport cloth seats, E-fan, Apikol rear diff mount, Nexus 7 HU, custom sound system & subwoofer, bixenon retrofit, 034 catch can, Deatschwerks FP.
Former: 1998.5 A4 1.8TM