2001 Eurovan GLS - Cranks But Won't Start

[61 BUS]

A few days ago, my check engine light came on. I did an OBD2 scan and got error code P0411 Air Injection Incorrect Upstream Flow Detected. No other error codes in any other system. The car still drove fine and I was planning on troubleshooting the aux air system. Today I went to start the car to check out the if the secondary air pump runs and the car wouldn't start. It turns over but won't catch. I did another OBD scan and there are no additional error codes. My battery is relatively new (about 7 months old). With the ignition switch off, it measures about 12.3 volts. When cranking, it drops to about 10.5 volts. There are no unusual sounds when cranking, just no-start. Any troubleshooting suggestions or ideas would be appreciated. This is my first foray into a non-air-cooled "modern" VW. Thanks.
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61 Bus, 2001 Eurovan GLS, 2013 Fiat 500 Abarth, 47 Plymouth Business Coupe, 58 BMW Isetta 300

[67rustavenger]

What scan tool are you using?
Most here use the VCDS scan tool. I have tried the auto parts store scanner and found that the VCDS will detect more fault codes than the FLAPs scan tool.

Sometimes, simply disconnecting the battery for 15 minutes to half an hour will clear things up with the ECU.

Have you looked for any blown fuses, especially for the fuel pump?

Someone way smarter than I will chime in with better ideas than what I have posted today.

Welcome to EV hell!
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[61 BUS]

My OBD2 scanner is an Innova 5610. I did check the fuel pump fuse and it's fine (it has continuity).
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61 Bus, 2001 Eurovan GLS, 2013 Fiat 500 Abarth, 47 Plymouth Business Coupe, 58 BMW Isetta 300

[Damian Shaw]

[SambaBurnsRed]

Need to get a scanner to check your crank position sensor, that will cause no start, easy fix too.

Also fuel pressure if the CPS checks out.

[jjvincent]

Most likely, it'll be a fuel pump. If it's a crank position sensor a generic OBDII reader will pick up a faulty one of them. It's not the immobilizer as if it was, it would run for about a second and shut off. As for the coil packs, it would be rare for them to lose power.

As for fuel, it'll never throw a code (EV is too old) and a good fuse does not mean the fuel pump gave up the ghost and ended it's life. I would guess if you could search here for where the fuel pump relay is, then jumper it. If you do that and there's total silence, then it's the culprit. If it does run you can also still open a fuel line and see if fuel comes out.

[Da TOW'D]

Give the Air Intake at the Air Filter a shot of Starter Fluid then crank
If it starts you might have a Fuel pump problem
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[TheOneTrueQuux]