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Way to Test PEM?

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
knobbynut
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Way to Test PEM?

Post by knobbynut » Sun Sep 15, 2019 2:20 pm

Is there a way to preform a resistance test for the PEM? I'd like to confirm the PEM is bad before getting to the fuel pump. The PEM is easy to get to. It's my understanding the gas tank will need to be dropped in order to access the pump.

dakinejb
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Re: Way to Test PEM?

Post by dakinejb » Thu Dec 05, 2019 4:38 pm

Did you ever figure this out?

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Re: Way to Test PEM?

Post by knobbynut » Fri Dec 06, 2019 6:31 am

Sorry no. I haven't found a way to test resistance on the PEM.

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abscate
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Re: Way to Test PEM?

Post by abscate » Thu Dec 12, 2019 4:38 pm

See user shockwaves post in the XC90 forum on PEM troublehsooting.

There are links to the waveforms and testing methodology

A resistance test on the PEM is useless. It is a waveform generator and converts ECM signals to fuel pump drive signals. You need an o scope and s9 electronics background to troubleshoot it, or get a used one from a wreck (. $15) and swap in
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