how do I check injector duty cycle with a multimeter? -

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Old 04-22-2011, 05:38 PM
1st Gear
Join Date: May 2004
Posts: 236
Default how do I check injector duty cycle with a multimeter?

I want to measure the injector duty cycle using a multimeter. There are two wires into the injector. I would think that I should ground one wire of the multimeter and tap into one of the injector wires. But which wire do I tap into? Or, do I not ground the multimeter wire and tap into both injector wires? I don't have a VAG-COM

1997 2.8.
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Old 04-22-2011, 06:28 PM

Join Date: Jan 2010
Location: Costa Mesa, SoCal
Posts: 1,885

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: VAG-COM, FrankenTurbo F21, Motoza E85/91 switchable tune, Bosch EV14 750cc injectors, 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, single mass flywheel/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.

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Old 04-22-2011, 06:37 PM
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Vagcom or a scope. A meter won't react quickly enough (you're talking milliseconds) to show you anything.
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Old 04-22-2011, 06:54 PM
1st Gear
Join Date: May 2004
Posts: 236

My multimeter has a duty cycle setting. I just need to know what wires to probe. There are two on the injectors.
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Old 04-22-2011, 06:54 PM
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audi, check, checking, cycle, duty, injection, injector, injectors, measuring, multimeter, read, tap, test, voltmeter, wire

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