Unplug ECU connectors A and B. In the free plugs, terminals A26 and B2 each should have low resistance to body ground, probably less than 10 Ohms but definitely less than 100 Ohms.

http://www.phearable.net/tech/wiring...schematics.gif

 

If resistance to body ground at A26 and B2 is low, as it should be, then the next step is to do some voltage tests.

1) Measure voltage (to body ground) at both top metal test tabs of hood fuse 31. What are the readings?

2) With the key in ON(II), measure voltage (to body ground) at both top metal test tabs of dash fuse 24. What are the readings?

3) Unplug ECU connector A and turn the key to ON(II). Measure voltage (to body ground) at terminals A23 and A24 individually. What are the readings?

 

OK, A26 is 3.6 Ohms, thats good. B2 is 29.4 Ohms, is that a bit too high?

Also, is the body ground you mentioned in 1. 2. and 3. the same G101? And would that voltage be AC or DC?

 

Based on the circuit diagram I posted, I would expect A26 and B2 to have nearly identical resistance. Repeat the B2 test and make sure both meter probes are making good metal-to-metal contact with the plug terminal and body ground.

 

OK the redo measured 5.3 Ohms.

 

OK, I went to check fuse 31, it apeared a bit loose, so I pushed it back in, and now the fuel pump is priming right away each time.

I feel a bit stupid.

 

Good job. Glad to hear you sorted out this frustrating problem.

 

Disregard last post, it was loose, but I let it sit for a bit, and nothing. When I pull it out and then put it back in it works though (I'm guessing doing this boots up the ECU?). Which ground should I voltage test with the fuses, G101? And should I measure AC or DC voltage?

 

Hmmm...maybe a bad fuse or hood fuse box. Is fuse 31 a bit loose? If so, just so slightly twist both metal prongs that insert into the hood fuse box receptacle. This should make for a more snug fit. If the fuse is tight, install a known good 15A fuse. Does this solve the problem?

Use the battery ground wire or thermostat housing as ground. Or the frame under the dash when working in the cabin.

 

Its nice and snug, I just noticed it was a bit loose when I was checking voltage, I measured the voltage, pushed it back in, and it primed. I cranked it up, and turned it off. I let it sit a bit and it has the same problem, but when I take the fuse out and put it back in it primes.

I replace it when it was off, and nothing, but when I take it out and put it back in, it primes.

Is there a ground wire under the dash, or if I just place it on the frame will it work? Also, should I have my multimeter set to AC or DC when measuring voltage?

Sorry if I sound like an idiot, I'm usually pretty good with cars, but I am an idiot when it comes to electrical systems.

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And on a side note:

I'm pretty sure thats gonna end up in a sig somewhere...