So after transplanting the entire 03 WRX drivetrain and wiring harness into my 97 OBS, I finish up wiring the fuel pump and the rest of the tank sensors and such and I try to start it and it just wont crank up. It just turns and turns but never fires up. It almost seems like its not getting fuel. the fuel temperature sensor isn't wired up, because i dont feel like removing the tank to wire it. The fuel pump has power,but I'm not sure if it's working (its the whole pump assembly, or cage, in the 97 OBS tank). I hope I didn't hook up the fuel lines going into the engine wrong. Unless the two large hoses (and one small one) coming out of the top of the tank are different on the two years. Should I swap in the old 97 cage with the new pump on it? It just sounds like its not cranking because its not getting fuel. perhaps the pump needs to be primed? I'm pretty sure its the fuel, but it could be anything, I took the whole working bits off a wrecked WRX and put them in the 97, so there shouldnt be any misplaced wires or anything. I didn't think resetting the ECU was necessary since it was all apart. Oh yeah also, All of my dash lights, except the clock, and the odometer, don't work.

Can you hear the fuel pump pressurizr the system when you turn the key to "on"? Don't turn it all the way to "start", just to "on" and listen for the pump. If you hear it buzzing it is working. An easier way to do it is turn the key to "on" and check the voltage at the plug. Use the '03 pinout chart in the wiring diagrams to see what the voltages should be.

My bet is that either your injectors or coil packs are not getting power. But that's just a guess. Check the pump, get back to us.

sounds like you are missing a ground

hve you tried to pull the ecu codes?

sounds like you are missing a ground

hve you tried to pull the ecu codes?
that or he missed a wire coming off the main relay and the ECU is just sitting there w/o powering up.

Do you have the full 03 WRX service manual? If so then under diagnotics there is a failure to start section. Follow everything to the letter and you will find your problem. Tells you exactly what to test how to test, such as what pin on the ecu connector for what voltage ect. If this is not an option, pull a spark plug, If it is fuel soaked you will know your getting fuel, Then check if your getting spark, put the spark plug in the coil pack, touch the threads of the spark plug to the block. Now try and start it see if your getting spark. Just some thoughts.
Joshua

I should probably also mention that I was using a mostly dead battery with help from another car jumping it. It would roll down the windows or play the radio just fine. You would think that if there was enough voltage to crank the car, there should be enough to cycle the fuel pump, but not a sound was heard from my fuel pump when i turned the key on. I checked all my grounds and double checked the wiring. Everything should be right. I don't think the lack of a fuel temp sensor would cause it not to start. I was thinking I would get a new battery because I need one anyways and see if the fuel pump will cycle. However, I'm afraid the problem is somewhere else. I don't have any way to run codes. But I have a voltmeter so I'm looking through the service manual...

Well I guess in order to see why the fuel pumps not working, I'll need to pull a code, it should also give me about 3 other codes.

you also need to get a good charge on that battery, a dead battery will play hell with an ECU. usually if your cranking voltage stays below 9 volts you won't have enough for the ECU to power up.

ok so with a fully charged battery....still no fuel pump. I cant figure out why. I'm going to go through the wiring again but im pretty sure everything is right

check the fuse

How do you have the pump wired up? are you using the fuel pump controller? If you dont hear the pump come on at all, one or more wires are off. Have you checked to see if the ecu is getting power and ground everywhere it should?

the whole WRX harness was used except for the fuel tank harness. the connector under the rear seat is where the WRX harness and OBS harness connect. The OBS harness is unable to provide the fuel temperature sender with a ground, so it is not connected. There is one other tank sensor that isn't being used. The fuel pump controller is being used and i just ran the rear WRX harness and fused my taillight connectors to it, so it shouldn't be any different than how it was in the other car. I guess it could be one of the grounds under the dash but i didnt think I missed any connections. The security system in the 03 (which has been unplugged) wouldn't affect anything would it?

no dash lights are coming on... if your check engine light doesnt come with accesories then that means your ECU doesnt have power.

maybe look into self-shutoff control?

i would just multimeter ecu power wires and ground everything to the body until you know the ECU is turning on... your fuel pump could be fine then if its that.

the check engine light is coming on before I try to crank it. I'm going to pull apart the floorboard to get to the ECU today.

Have you even checked to make sure your relays are switching, main releay fuel pump relay, starter realy ect? Have you checked the Fuel pump relay? Is there power at the relay? If it is switching is there power being transfed to the otherside of the relay to the pump? Checking the relays would be one of my first stops.
Joshua

Ok so i see in the wiring diagram that the factory security system which is present on my harness might have to be bypassed, If i've removed the box, what else do i need to do? Does it just cut power to the ECU? because the starter works just fine.

Why are you asking for help if your not willing to try any of the things people are suggesting. I've responded many times trying to help you, and so far you don't seem to have tried any of them. Trying what I have suggested would be of great benifit to you and people on the board, in diagnosis of the problem.
Joshua

Why are you asking for help if your not willing to try any of the things people are suggesting. I've responded many times trying to help you, and so far you don't seem to have tried any of them. Trying what I have suggested would be of great benifit to you and people on the board, in diagnosis of the problem.
Joshua


Thank you so much for saying that, i was thinking the exact same thing.