A basic approach to no-start diagnosis is to try and figure out what is missing: fuel or spark. Since you didn't mention if spark was checked, I suggest checking that next. It is a bit more difficult on a van due to space constraints, but if you take off the engine cover inside the van it is much easier. Use a spark tester or take off one of the spark plug boots and insert a screw driver, then lay the screwdriver on the engine. If the ignition system is working, you will see a spark jump from the metal shaft of the screwdriver to the metal on the engine. Try to arrange the screwdriver so that the shaft is not directly touching, leave a 1/4" gap for the spark to jump. The spark tester is cheap and easy alternative to the screwdriver if you want. It simply plugs into the removed boot, and clips to the engine. A little window shows the spark jumping.
If there is no spark when cranking the engine, the ignition module most likely is bad. Replace it and retest. If it still does not start, then you should probably seek help. If you wanted, you could also check the electrical signal that controls the injectors by using a "noid" light, this entails disconnecting an injector and plugging the connector into the noid light. If the light flashes, then you know the injectors are getting commanded to inject fuel.
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