Swapped Tranny, No Fuel Pressure

JoeShmoe · #1 08-05-2008, 10:40 AM

Cliff notes 98 SE V6 2.5

Swapped transmission and torque converter
Now I don't have any fuel pressure to my engine
Pump is good, but no power to pump location
Fuses seem to be good, Fuel Shutoff was not tripped

WTF?

Going to bypass Inertia Switch by jumpering
Going to replace Fuel Pumpo Relay if possible
What is a PCM? Power Control Module? What does it look like/where is it?

I'm burning out on this one, I can't figure it out. Please Help Guys

Thanks,
JoeShmoe

beyondloadedSE · #2 08-05-2008, 05:08 PM

PCM is located in the passenger side footwell. I doubt its your PCM.

Check the 15 amp fuel pump fuse as well as the fuel pump relay. My bet is one of those.

JoeShmoe · #3 08-05-2008, 05:23 PM

The fuse is good there. I'm going to check right now all my fuses and harnesses again.

rhandwor · #4 08-05-2008, 05:52 PM

Normally on this type of job you unplugged something and didn't plug it back in when you finished. Go everything you disconnected and make sure you plugged it in when done.

JoeShmoe · #5 08-06-2008, 06:39 AM

Update, my fuel shut off was not tripped. Fuel pump realy is good also, everything looks to be connected. What connection could it be if any are loose?

rhandwor · #6 08-06-2008, 07:11 AM

If you felt the fuel pump relay click put your finger on it and you can feel it click. The relay may be good but if it looses the ground it won't click. Check the fuel pump ground. Ground locations left rear of trunk. Right kick panel.
Behind left head lamp. Fuse 14 under battery tray battery support
If it was running when shut down their is a 95% chance you disconnected something of didn't connect a ground wire.
Reach above the fuel tank and disconnect the electrical connection to the fuel pump. Put a 12 volt test light or DVOM and check for power if you have 12 volt a new pump is your best bet. Follow the wire to the next plug check for power. You can pick up the relay try and check for power to the pump. If you have the old green relay with 4 prongs make a jumper. The two normal size prongs make a jumper and if the fuel pump starts your problem is here. Use a 12 volt test light connected to ground check for power to the small prong if you have power. Connect the test light to positive if it lights when trying to start.
the relay is bad if the pump runs with a jumper. If you have a 5 prong relay go to http://www.alldata.com/ buy a years subscription and follow the wiring diagram.

JoeShmoe · #7 08-06-2008, 10:39 AM

My pump is good and I'm not getting power past the fuse box. My relay and fuel cut off switch are also good, leading me to believe that maybe a pin on my pcm or engine harness is bent and not making proper contact to feed the power to the pump. I'm going to check my connections again though.

beyondloadedSE · #8 08-06-2008, 04:02 PM

Quote:

Originally Posted by JoeShmoe

My pump is good and I'm not getting power past the fuse box. My relay and fuel cut off switch are also good, leading me to believe that maybe a pin on my pcm or engine harness is bent and not making proper contact to feed the power to the pump. I'm going to check my connections again though.

Why would a pin be bent on the PCM? You shouldnt have touched that when doing the swap.

rhandwor · #9 08-06-2008, 05:19 PM

If you forgot to disconnect the ground before you started you probably blew a fuseable link. Look in the relay box for fuseable links. They sell them at the parts store. Look around the starter sometimes a hot wire is feed from this area you might not have hooked it up. Start at the battery cable use your test light and make sure all big wires have power.

JoeShmoe · #10 08-07-2008, 08:24 AM

I did not finish tracing my cables back but I did rule out several things. I'm getting constant power to the to my relay and a clear/unobstructed path to my fuel pump. Switch at the fuse box is good, swapped into the horn location and it worked just fine.

That means that my problem lies in the feed to the fuel pump relay switch. I believe it is a black/blue cable. I haven't had time to follow it all the way back though. Do you guys know where the bundle of wires goes just past the driver side connector? So far I've traced that black/blue feed wire there.

beyindloadedSE, I didn't think I touched the PCM, I can't even find it. What is the connector right behind the power steering resorvoir on the firewall? I think that might be were the problem is. I still have to keep following wiring some more tonight.

rhandwor · #11 08-07-2008, 10:09 AM

Check fuse 9 in the engine compartment fuse box. Check the ground for the pcm relay behind left head lamp. Check ignition relay. Check power from ignition switch. Check engine harness near left strut tower. Computer ground behind power steering reservoir. It appears the pcm relay clicks and feeds power to the fuel pump relay control circuit.

JoeShmoe · #12 08-07-2008, 11:56 AM

Fuse 9 is good.
Ground is good behind both lamps (under fuse box and on wall beside hood prop.)
Don't know where the ignition relay is at, manual does not call it out all though wiring diagram does.)
Haven't followed wire to the ignition yet.
Harness by strut is good, checked thouroughly. Pins are good.
Ground behind the resorvoir, really? I will def check it out as soon as I get home.
I can't locate PCM relay, but my fuel pump relay is not getting power to activate the click. I'm working my way from the harness(by strut tower) to the other side of the engine. I hope its only forgeting to ground the PCM behind the PS resv.

Thanks rhandwor. Good ideas, really helps out.

rhandwor · #13 08-07-2008, 03:17 PM

My picture says items are in engine compartment fuse box. Look at main fuse 50 amp.red wire ignition relay is in interior fuse panel. You should find it tonight.

JoeShmoe · #14 08-07-2008, 04:08 PM

Ok, so its going to be coming from the interior fuses to the engine fuses. I'm going to try and snap some pics for you guys.

beyondloadedSE · #15 08-07-2008, 04:48 PM

Quote:

Originally Posted by JoeShmoe

beyindloadedSE, I didn't think I touched the PCM, I can't even find it. What is the connector right behind the power steering resorvoir on the firewall? I think that might be were the problem is. I still have to keep following wiring some more tonight.

Thats the harness that leads to the PCM in the passenger side footwell. That harness is securely bolted to the car so like I said, it should be undisturbed and you shouldn't have touched it. If you want to find the PCM, get down on your back and lay down in the passenger side footwell and look up behind the glove box and you'll see a shiny stainless steel box. Should have a big white clip holding it in. Take off that white clip and you'll see a black plug with a sticker on it. On the sticker should be your computer code. It will be 3 numbers and 1 letter. (i.e. My 96 was XXY2).

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