1995 S-10 2.2 won't start

I am trying to help my 15 year old grandson put a truck together that someone else took apart. We seem to have got it all together in the right order but are not able to get any power to the fuel pump so that it will start. We went through the trouble shooting guide in a GM manual and got all the way down to where we don't get any power on wire 465 frrom the pcm. We tried another pcm with the same results. I checked for a ground with a ohm meter and everything seems fine. I am not sure what voltage and where I should be getting it going to the pcm. Any help or advice would be greatly appreciated.

Jim & Ethan

Reply to
Ford racer
Loading thread data ...

If its like my 96, if it does not see oil pressure it will not start. There is a dual sensor that powers the gauge and the start sensor.

Bob

Reply to
Bob Urz

The only diagram I could find was for a 96/97 s10/blazer 2.2, I don't know if that is the same as yours? It shows an oil pressure switch wired in parallel with the fuel pump relay. Once you crank it enough to build oil pressure, the switch closes and the pump runs reguardless of what the pump relay is doing. That is a fused circuit, did you check fuses?

This diagram shows a fuel pump prime connector coming off the relay, you should be able to run the pump from there, for a test.

The ground for the coil side of the relay is constant, the ecm sends a voltage to the coil side, to control the switch side.

Can you communicate with the computor? Any codes?

This diagram I'm looking at, may not be correct for your vehicle?

Reply to
jdl

That's the same diagram as I have in the 1995 book. I can get power to the fuel pump connection by applying power to the fuel pump test point. All fuses and fuse links are good.I just am lacking power to bring in the fuel pump relay from terminal F-6 (Wire 465) on the pcm.

Thank you, JIm

jdl wrote:

Reply to
Ford racer via CarKB.com

It's like the 96 and I jumped out the oil pressure switch and fed power to the fuel pump but that still doesn't get me anything to terminal F6 (wire

465) on the pcm.

Thanks, JIm

Bob Urz wrote:

Reply to
Ford racer via CarKB.com

When you apply power to the pump, it does run, correct?

Forget the relay for a minute, will the vehicle start and run?

Once you crank it enough to build oil pressure, the pump should run, does it? Do you have fuel pressure?

Reply to
jdl

Reply to
Ford racer via CarKB.com

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.