How to Fix/Repair your Main Fuel Relay

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How to Fix/Repair your Main Fuel Relay

Postby Geo » Thu Sep 15, 2005 2:40 am

Here's the link to it: Main Relay Repair
Attention Link updated now due to change on his site

I thought it was posted up here before, must of been the other UK Sol board, anyway it's back now. Enjoy.
Last edited by Geo on Mon Jun 26, 2006 9:03 pm, edited 1 time in total.
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Postby chubb » Thu Sep 15, 2005 11:18 am

Thats a very useful How to, many thanks for posting that!
IT'S ALL ABOUT SETTING THE TRENDS :D
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Postby the_rhino_uk » Thu Sep 15, 2005 6:34 pm

Thanks mate, thats just what I was after for the site!

Ticked off the list now :wink:
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Postby Camile » Mon Jun 26, 2006 10:31 am

thread updated 8)
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Postby Camile » Sun Jul 02, 2006 10:15 am

here's another good link that i found on team sol :wink:
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Postby Geo » Mon Jul 03, 2006 2:45 am

Good one Camile, I expecically like "How the PGM-FI Relay Works" and the code #16 problem with it. Good info to know.
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Re: How to Fix/Repair your Main Fuel Relay

Postby solman » Thu Apr 24, 2008 1:01 pm

I think mines on its way out and needs mending, found this useful also.

http://techauto.awardspace.com/mainrelay.html
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Re: How to Fix/Repair your Main Fuel Relay

Postby solman » Sun Jul 13, 2014 5:55 pm

Thought I would revisit this as we've been having a lot of posts or probable main relay problems recently. This is how to swap it, its not difficult. Worst bit is where the relay is located.

The new main relays from Honda have changed a fair bit, the part number is still the same 39400-S10-003

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The internals are different as well
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Tools required

Small socket wrench
10mm socket
Small extender bar
Torch (possibly)

Should take no longer than a few minutes

Pull off the fuse cover
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Undo the 2x 10mm nuts holding the fuse board in
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The main relay sits in behind the fust board, it makes life a little easier to move the board out the way a touch. Its held in with 1x 10mm nut at the top.
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You may find it easier to remove the relay next to it, its only held in with one 10mm nut.
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Refit in reverse, job done.

You can resolder the relay, however I've never had much joy getting these to last much longer than a year before they need doing again. Honda charge about £60 for a new one, I'm sure you could find a new relay from mitsuba elsewhere. You'll notice the rats nest of wires around my relay, that'll be the immobiliser wires.
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Re: How to Fix/Repair your Main Fuel Relay

Postby SiR_chris » Mon Jul 14, 2014 1:26 pm

Nice one mate
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Re: How to Fix/Repair your Main Fuel Relay

Postby lxstuart » Wed Jul 16, 2014 12:11 am

Nice write up.
I re soldered the main relay on my Prelude ~3 years ago and haven't had any problems since.
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SmithYo wrote:bollocks to wd40.... bita spit normally works a charm ;)

crazyasswhiteboi wrote:was worth the effort, just needed a little wriggling when putting in...


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