What does the test actually do? Does it
A: Jumper ground (or positive) to an input on the EEC?
B: Jumper ground (or positive) to the fuel pump relay?
Or
C: something else.
I recently had a problem with my air horns for my alarm. I had changed the fender and removed the factory horns. Needing to get the car to pass inspection, (You Colorado guys are lucky) I needed to use the air horns as my main horn also. I hooked up a button to the relay that my alarm used and used diodes do not to feed back to the alarm.
I tried the switch and nothing, so I set the alarm off and Whamo! there they went. I removed the diode (I checked and checked and it was in correctly, and the voltage to the relay only showed the .7V drop that it should, besides a relay will pull in with less than 9V). I also removed the connection from the alarm. Still no luck. Went back and forth testing and testing. Even replaced all the wiring and three different switches, and EVERY time it would work with the alarm, and Nadda with the switch. Finally after 3 hours I got it to work correctly.
Next day on the way to the inspection station after driving 30 miles, and 5 miles from the station I pushed the button, and it worked. I am watching the guy inspect the car to keep him distracted as possible, he tries the Horn and nothing. I tested and pushed and nothing. Ok so I ask him if there is an auto parts store around I'll get a new relay. Get the relay (and a new gas cap, it was bad). Put the new relay in and all I get out is a short blast. The guy said ok and I kept my mouth shut.
It was the compressor.
Jeff