CHECK ENGINE, 3 codes at once?

[jes]

I had the CHECK ENGINE light come on yesterday & I am seeing 3 codes

15 - Injector #2
24 - by pass air control solenoid
35 - purge control solenoid

I am baffled by 3 codes at once... we've visually checked, what we can see, and there is no obvious damage to wiring or components. Next step is with a DVM, but I'm ~350 miles away. Any advice would be appreciated.