p0231

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Sep 17, 2011 | 06:26 PM

butch h

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p0231

My '02 Escape quit running, abruptly the other day. It will start on starting fluid, so I'm reasonably sure it is fuel related. What is the most likely problem that would set the p0231 code?
Thanks,Butch

Sep 18, 2011 | 08:07 AM

wptski

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From: Warren, MI

Quote:

Originally Posted by butch h

That code is for "Fuel Pump Secondary Circuit Low".

Sep 19, 2011 | 05:42 PM

butch h

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Thanks, but where is this secondary circuit? If I were to put 12 volts directly to the pump assy. ,would it operate?

Sep 19, 2011 | 06:28 PM

wptski

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From: Warren, MI

Quote:

Originally Posted by butch h

Thanks, but where is this secondary circuit? If I were to put 12 volts directly to the pump assy. ,would it operate?

I have no idea whatn they mean by secondary circuit.

They don't seem to have a detailed diagram covering the FP in the manual only a crude block diagram. It shows the FP relay powering the FP and PCM, so it sounds like that's not it. There is the inertia fuel cutoff switch. It's possible that has tripped or faulty. Look in your ownwer's manual for location.

I'm working on a old GM product right now and it has FP Prime Test Lead. You connect it directly to a +12V source to run the pump constantly.

Found a simple diagram.