No Fuel Pressure...WTF???

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Oct 3, 2004 | 03:36 PM

WillieD

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From: Lewisville, TX

No Fuel Pressure...WTF???

The past couple days my car has been running weird, and I found out is was throwing code P0102 yesterday. I checked all of the fuses and all was well, and decided to run new wires to the MAF. I have had an issue with wires shorting out before and had to do the same thing for the Temperature control sensor a few months back. Anyways, I got the wiring done for the MAF, then double and triple checked the wires I had to splice into to run the new wires to make sure all was good. Well it is all hooked up now and the motor will turn over, but I have zero fuel pressure. I have no idea what I could have messed up from the top of the motor to cause this. I checked all of the wires going to the PCM to make sure nothing was pulled out. I also checked all of the car's fuses, including the extra fuse for my Racetronix fuel pump and it all looks good. What else should I look at to figure out where the problem lies? I need to get my car running tonight, so any help would be really appreciated.

Oct 3, 2004 | 04:30 PM

MIGHTYMOUSE

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From: Virginia

does the fuel pump run when you key the car or not?

Oct 3, 2004 | 04:42 PM

WillieD

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From: Lewisville, TX

I can not hear it, so I would say no

Oct 3, 2004 | 05:14 PM

WillieD

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From: Lewisville, TX

the power to the pump runs directly from the alternator. I checked the car's fuel pump fuse and the inline fuse for the pump, and they are both fine, and the power wire is still connected. What could I have done from the top of the car to keep it from coming on? I am baffeled (sp?)

Oct 3, 2004 | 05:21 PM

MIGHTYMOUSE

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you must have added a relay.. is the relay clicking?

Oct 3, 2004 | 05:31 PM

WillieD

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Are referring to the new Relay for the Racetronix system? If so, I just got back there while my wife turned the key to run a few times and did not hear anything.

Oct 3, 2004 | 06:48 PM

WillieD

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I busted out the voltmeter and I am getting power to the relay, but not it is not going past it. I had my wife turn the ignition off and on testing the power going from the relay to the pump and the grey (switch) wire. Neither of those were seeing any power. I think maybe the grey wire is jacked up also. Does that wire run all the way to the PCM? If so does anyone have any clue which pin #?

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Oct 3, 2004 | 07:05 PM

WillieD

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From: Lewisville, TX

I unplugged the factory wiring in the back, and put the voltmeter directly to the lead for the grey wire leading out and never even saw a spike when the ignition was turned on. If that wire is bad, I don't know how I can trace it back to the PCM. To see if power was getting past the relay I unplugged the power wire where you guys have that little harness before it reaches the pump and tested it there. Again, it had no movement when the ignition was turned on.

Oct 3, 2004 | 08:11 PM

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WillieD

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From: Lewisville, TX

I would run a test line for the grey line from the PCM to the rear harness to see if that works, but I can not figure out which PIN it is. When I test the line I don't get a buzz, so I can not locate it. I am starting to think this is my problem, but don't know how to solve it. Any suggestions?

Oct 4, 2004 | 01:18 AM

#11

Racetronix

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From: A Racetronix dealer near you...

Quote:

Originally Posted by WillieD

You can not power the pump directly from the PCM.

The first suggestion would be to contact support@racetronix.com.

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Oct 4, 2004 | 10:02 AM

#12

WillieD

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From: Lewisville, TX

e-mail sent along with the link to this post

Oct 4, 2004 | 09:42 PM

#13

WillieD

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From: Lewisville, TX

I tried another relay, and that did not do the trick....

Oct 4, 2004 | 10:00 PM

#14

Racetronix

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From: A Racetronix dealer near you...

Quote:

Originally Posted by WillieD

I tried another relay, and that did not do the trick....

We sent you some detailed diagnostic information. Please review and go through it carefully. Once you have narrowed down the problem please e-mail us.

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Oct 4, 2004 | 11:27 PM

#15

WillieD

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I have been following those and it has helped me understand the wiring. I am getting a solid connection from the #9 pin on the PCM to the relay, from the relay to the grey wire in the back, from the relay to the ground as well as the fuse. I can not figure out what the dark blue wire at pin 30 goes to. What exactly is the BCM?

Unfortunately I do not have a tool to keep the pump relay on, so I have to keep turning the ignition on and off.

I had to stop there because I went to unhook the battery it broke. The terminal was stuck on there and when I tried to unscrew it, a whole chunk of the battery came off with it. So until I get a new battery tomorrow I can't do much else.

Oct 5, 2004 | 12:09 AM

#16

Racetronix

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From: A Racetronix dealer near you...

Quote:

Originally Posted by WillieD

BCM is the body control module. It is used for the VATS (vehicle anti-theft system)

Follow the diagnostic chart and operational description with it.

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Oct 5, 2004 | 12:13 AM

#17

Racetronix

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From: A Racetronix dealer near you...

E-mail us your phone number too. Daytime and evening.

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Oct 5, 2004 | 09:56 PM

#18

WillieD

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Well, I am good to go now. It turns out my problem arose from my other "fix". When I ran new wires for the MAF I went straight from the PCM to the MAF, and apparently that is not good. I guess the MAF wiring travels through something else before it reaches the computer. I thought I was good to go because the voltmeter was giving me a signal from the MAF to the PCM ends of the wires, but running straight wires between them is WRONG!!!!

I undid that wiring and everything was good. I took it for a short spin and I did not have my P0102 code show up and my car did not sputter. Who knows if it will pop back up tomorrow, we will see. It kind of pisses me off that what I thought would be a fix for the P0102 code I was throwing was screwing up my fuel system from getting power.

Thanks for all of the help and ideas that you guys pitched in. I have learned more about my car and the fuel system wiring from the ordeal, and I just hope that code does not come back tomorrow.

Willie