Working on my son's '01 civic. It died while driving and would not restart. Found a 15 amp fuse marked FI ECU blown. Replaced it and when I turned the ignition on it blew instantly. Did some online research and all I found seemed to indicate the fuel pump relay was bad. What I found online said it was blue relay behind the glove box. Replaced that and the fuse still blew. Even with relay out it blew. There was a brown relay beside the blue. Replaced it and it still blew. Removed it and, bingo, it did not blow. Replaced brown relay and disconnected wire to fuel pump. It blew. So the only way to keep fuse from blowing is to remove the brown 4 blade relay. What does this go to? Must be a fuel problem as it will try to run on starting fluid.

Would appreciate any advice anyone can offer, I'm stumped.

Thanks for your time, Rick

More Info: Looking in a Chilton's it appears this is the PGM-FI main relay No. 1. What does it feed?

Thanks, Rick

 

Post what specific fuse # is blowing.

Edit: Irrelevant text and diagrams deleted.

 

My '91 also has the fuel pump relay on the left side of the car near the hood release lever. It doesn't have any relays behind the glove box. The only parts there are all related to the air conditioner.

Try unplugging the fuel injectors and see if the fuse holds. Is this a DPFI (two injectors on the throttle body, 1.5 liter engine) or a Si with the 1.6 liter and MPFI?

 

I'm sorry, I made a typo. It's not a '91 it's a 2001. I assume this might a difference in fuse/relay locations.

I'll try disconnecting the FI's and see what happens.

Thanks, Rick

 

What specific fuse # is blowing?

 

Hello Ron, thanks for the input. In the fuse panel under the hood on the passenger side it is indicated as number 6 in the diagram on the fuse panel lid. Marked FI ECU. It's a bout dead center of the panel.

There are wires going into the valve cover from both sides. I disconnected the passenger side and it still blows the fuse. Was about dark and I couldn't see enough to figure out how to disconnect the drivers side wires. Will see if I can get to that today in the light.

I am really about frustrated and am about to load it on a trailer and haul it to a shop.

Thanks for your help, Rick

 

Yeah, start by running the electrical tests described in the diagrams.

 

Thanks a bunch for your help Ron.

Rick

 

Stop. Don't do the main relay 2 tests shown in the diagram. Are you sure that disconnection of main relay 1 but not main relay 2 prevents fuse 6 from blowing (see diagram above)? If so, then the problem is not with the fuel pump circuit as main relay 1 instead controls power to several other components, including the ECU, IACV, TDC & CKP sensors, fuel injectors, and the immobilizer receiver (see below). Disconnect each of these components one at a time to see which prevents fuse 6 from blowing. The one that has this effect has the short circuit.

 

Thanks Ron. Fortunately I have not had time to fool with it. My Son and I are going to tackle it some today (it finally warmed up a little - I don't do cold weather very well). I will have to do some searching as I don't know where all the components listed are located. Hopefully the Chiltons will help.

Thanks, Rick