I need some help here, I've done a lot of reading on the forums about fuel pumps and changing them out. So, my fuel pump went bad (I thought). I changed it out using the trap door method and the new fuel pump would not work. I jumped the new fuel pump to the battery using the fuel pump prime connector and the fuel pump did prime after this. So after this I tested the wire at the relay , I' think I'm supposed to get a hot reading from the orange wire which is from the battery, and a hot reading from the green wire which is PCM with the key turned. I'm not getting a hot reading from either of these. What could be the problem? I changed out all the fuses and still nothing? anyone have this problem and if so how did you fix it?
edit* I also changed the relay to a new relay to make sure it wasn't the relay that was not working. The new relay had no effect.
well im sorta of no use to you. lol 97 is way different than i have. i know the body control modual controls alot more in the 97 and may very well control the fuel pump. there are some good wiring diagrams on shbox. heres a link to the repair home page. good stuff. http://shbox.com/1/4th_gen_tech1.html
Hopefully this will help out a bit. I'm going mad with this thing. I've got it all torn apart on the inside and I have the Haynes manual with the wiring diagram but it's not easy to read and I can't find anything on the internet. It told me to change the fuel pump fuse in there and that the fuse was in the i/p panel #3 fuse. It says it was a 15 amp fuse. I couldn't really tell which one it was so I replaced every single 15 fuse in the car, still no help.
From what I can gather around on these forums I'm leaning toward it being a faulty PCM. I hope it's not because I don't really know what it will take to replace that let alone where to find one and get it programed for the car.
This may help.
How it works.
When key is turned on the PCM will operate the fuel pump relay. The fuel pump relay provides battery power to the fuel pump. NOTE! If the engine does not start within 2 seconds, the PCM will release the pump relay and the pump will have no power.
The pump circuit has 2 power feeds: 1) Pump Power, Always hot through the 20 AMP fuel pump fuse (under hood panel), through the closed contacts of the pump relay (under hood panel), and then to the fuel pump.
2) Relay control, 12 Volt from the PCM to the pump relay coil. The12 Volt power to relay coil is provided when the ignition switch is in the ON or Start position, but only for 2 seconds if the engine fails to start.
I would suggest that you should look towards some good information or step by step procedures on how to replace a fuel pump for this one. I would say that you need to change it or fix it with some necessary actions. I hope that things would work out well and it will be effective.
Last edited by archebald23; 04-01-2011 at 01:38 AM.