Main relay

89ExiledSi · Sep 23, 2012

Ok so I've done some research an it seems that the main relay might be the problem. But I don't wanna buy a new
If it isn't. So I grabed one out of a 90 legend will this work

The top one is from the legend

car_boy_16 · Sep 23, 2012

Wow it sure as shit looks the same. If it were my situation I would plug it in and see, but wait for others to chime in to be sure. If they are compatible then we can use main relays from:

ACURA INTEGRA (1986 - 1993)
ACURA LEGEND (1986 - 1990)
ACURA VIGOR (1992 - 1994)
HONDA CIVIC (1988 - 1991)
HONDA CRX (1988 - 1991)

Which of course would be very nice to know!

1funryd · Sep 25, 2012

car_boy_16 said:
Wow it sure as shit looks the same. If it were my situation I would plug it in and see, but wait for others to chime in to be sure. If they are compatible then we can use main relays from:

ACURA INTEGRA (1986 - 1993)
ACURA LEGEND (1986 - 1990)
ACURA VIGOR (1992 - 1994)
HONDA CIVIC (1988 - 1991)
HONDA CRX (1988 - 1991)

Which of course would be very nice to know!

This information needs to be permanently stickied somewhere. Man I purchase a new fuel for my 88 from autozone and the same relay cost me $99 plus tax.

This is half the price!!! Good info.

I remember this mentioned in other threads, but did not see the year makes and models listed like this.

Kalgorn · Sep 23, 2012

Not sure about it working, but I recommend just trying to reflow the solder. I did that to mine and it fixed the starting problems I was having. You can get a soldering iron for like $8 at Radioshack and a tub of flux for $5 or so (you'll need it).

car_boy_16 · Sep 23, 2012

If you resolder, this can help a lot:

http://techauto.awardspace.com/mainrelay.html

Kalgorn · Sep 24, 2012

Good link, but I wouldn't go to the work of removing all the old solder and replacing it with new. Just reflow all the points. If any of them look low, add a little more.

Sciroccoboi16v · Sep 23, 2012

Um plug it in and see? You won't hurt anything

89ExiledSi · Sep 23, 2012

Well I'm getting power through the legend ecu but I'm still not getting spark or power to the fuel pump
Hmmm

89ExiledSi · Sep 23, 2012

Does anyone know a way to test the ecu

89ExiledSi · Sep 24, 2012

dano · Sep 24, 2012

So...you are using a Legend ECU in a Prelude ??

89ExiledSi · Sep 24, 2012

No im not using the ecu out of the legend just the main relay. Which my luck doesnt work(i got it from a junk yard) So im going to order a new one cuase i the resoldering didnt work on them. Is there a way to test the main relay also i wanna test my ecu too

1funryd · Sep 24, 2012

You obvisouly have not read the FAQs at the top of the forum, there are all the links to all the information you will ever need.

Download the PDF online manual from here: www.1funryd.com
Its at the bottom of the page, and do your trouble shooting from there.

Now make sure to read first.

car_boy_16 · Sep 24, 2012

Main Relay test:

For the 3rd gen Prelude: http://i.imgur.com/GrZsZ.png

For the 1st gen Legend: http://techauto.awardspace.com/legendmainrelay.html

They seem to have the exact same test procedure.

I'm not sure on ECU testing. Why not download the Prelude's Factory Service Manual?

89ExiledSi · Sep 24, 2012

car_boy_16 said:
For the Prelude: http://i.imgur.com/GrZsZ.png

thx man that really going to help

car_boy_16 · Sep 24, 2012

I updated my post above.

Here is the ZIP to the PDFs for the Prelude's factory service manual. Three pdf files in total, first one is the full 1988 manual, and the second and third are 1989 and 1990 supplemental (updated information), respectively.
http://api.viglink.com/api/click?fo...downloads.hondatech.info/Auto...e%20Manual.zip&jsonp=vglnk_jsonp_13484673897283 <-- clicking this link should start the download right away, don't be alarmed.

89ExiledSi · Sep 24, 2012

well ive had the manual I just figured yall would have some tips or previous knowledge

Thizalude · Sep 24, 2012

Main relays just need soldering to get them to work again, they don't normaly just die unless your car has a serious short somewhere, chances are that if you order a new main relay it will also get fried instantly because of the short in your car, this has happened to me. Check your main relay harness if all wires are still good using the manual, check where can the short be, if you can't find it then I suggest you rig your main relay with jumper wires, a switch and two 10 amps fuses, this method will provide power to the ECU, petrol pump and injector drivers, nothing will burn or get fried I did it and my lude is still up and running

89ExiledSi · Sep 25, 2012

So the legend relay works. My ecu works, I found out my fuel pump was shorting out in side of it and cuase the ecu not to turn on. so now to find a fuel pump. So im going to go back to the legend to see if i can re-use that fuel pump

car_boy_16 · Sep 25, 2012

Haha cool!! So we can use the Civic/Integra/Legend Main relay..very good! They are half the price of the Prelude ones.

What is your relationship with this Legend? Yours? Or a junkyard car?

89ExiledSi · Sep 25, 2012

The legend is a junk yard car

car_boy_16 · Sep 25, 2012

If you're wondering if that fuel pump is compatible or interchangeable with the Prelude's pump, it is according to aftermarket part number cross-referencing.

The actual pump itself can be sourced from all of these cars:

ACURA INTEGRA (1990 - 1993)
ACURA LEGEND (1986 - 1995)
ACURA NSX (1991 - 2005)
ACURA VIGOR (1992 - 1994)
BUICK LESABRE (1991 - 1993)
BUICK PARK AVENUE (1991 - 1995)
CHEVROLET NOVA 1988
CHEVROLET SPRINT (1987 - 1988 )
DAIHATSU CHARADE (1988 - 1992)
DODGE COLT (1989 - 1990)
DODGE COLT 100 DL (1989 - 1990)
DODGE COLT 100 E (1989 - 1990)
DODGE COLT 100 LX (1989 - 1990)
DODGE COLT 200 DL (1989 - 1990)
DODGE COLT 200 E (1989 - 1990)
DODGE COLT 200 LX 1989
DODGE COLT DL (1989 - 1990)
DODGE COLT E 1989
DODGE COLT GL 1990
DODGE COLT GT (1989 - 1990)
DODGE STEALTH (1991 - 1996)
EAGLE SUMMIT (1989 - 1990)
EAGLE TALON (1990 - 1994)
FORD FESTIVA (1989 - 1993)
FORD PROBE (1989 - 1992)
GEO PRIZM (1989 - 1992)
HONDA ACCORD (1986 - 1993)
HONDA CIVIC (1988 - 1991)
HONDA CRX (1988 - 1991)
HONDA PASSPORT (1994 - 1995)
HONDA PRELUDE (1988 - 1996)
HONDA WAGOVAN (1988 - 1989)
INFINITI G20 (1991 - 1994)
INFINITI J30 (1993 - 1997)
INFINITI Q45 (1997 - 2001)
ISUZU AMIGO (1989 - 1994)
ISUZU IMPULSE (1985 - 1989)
ISUZU PICKUP (1988 - 1995)
ISUZU RODEO (1991 - 1995)
ISUZU TROOPER (1988 - 1993)
LEXUS ES250 (1990 - 1991)
LEXUS LS400 (1990 - 2000)
MAZDA 323 (1986 - 1991)
MAZDA 626 (1986 - 1992)
MAZDA 929 (1988 - 1991)
MAZDA B2200 (1990 - 1993)
MAZDA B2600 (1989 - 1993)
MAZDA MILLENIA (1995 - 2002)
MAZDA MPV (1989 - 1995)
MAZDA MX-6 (1988 - 1992)
MAZDA PROTEGE (1990 - 1991)
MAZDA RX-7 (1986 - 1995)
MERCURY CAPRI (1991 - 1994)
MERCURY TRACER (1988 - 1989)
MITSUBISHI 3000GT (1991 - 1999)
MITSUBISHI ECLIPSE (1990 - 1994)
MITSUBISHI GALANT (1985 - 1990)
MITSUBISHI MIRAGE 1989
MITSUBISHI SIGMA (1989 - 1990)
NISSAN 240SX (1989 - 1998 )
NISSAN AXXESS 1990
NISSAN MAXIMA (1992 - 1994)
NISSAN STANZA (1990 - 1992)
OLDSMOBILE 88 (1992 - 1995)
OLDSMOBILE 98 (1992 - 1995)
PLYMOUTH COLT (1989 - 1990)
PLYMOUTH COLT 100 1990
PLYMOUTH COLT 100 DL (1989 - 1990)
PLYMOUTH COLT 100 E (1989 - 1990)
PLYMOUTH COLT 100 LX (1989 - 1990)
PLYMOUTH COLT 200 DL (1989 - 1990)
PLYMOUTH COLT 200 E (1989 - 1990)
PLYMOUTH COLT 200 LX 1989
PLYMOUTH COLT DL (1989 - 1990)
PLYMOUTH COLT E 1989
PLYMOUTH COLT GL 1990
PLYMOUTH COLT GT (1989 - 1990)
PLYMOUTH LASER (1990 - 1994)
PONTIAC BONNEVILLE (1992 - 1995)
STERLING 825 (1987 - 1988 )
STERLING 827 (1989 - 1991)
SUBARU IMPREZA (1993 - 1997)
SUBARU LEGACY (1990 - 1998 )
SUBARU SVX (1992 - 1997)
SUZUKI SIDEKICK (1989 - 1991)
SUZUKI SWIFT (1989 - 1994)
TOYOTA 4RUNNER (1985 - 1991)
TOYOTA CAMRY (1985 - 1991)
TOYOTA CELICA (1983 - 1993)
TOYOTA COROLLA (1985 - 1993)
TOYOTA CRESSIDA (1985 - 1992)
TOYOTA LAND CRUISER (1988 - 1992)
TOYOTA MR2 (1985 - 1995)
TOYOTA PICKUP (1984 - 1991)
TOYOTA PREVIA (1991 - 1994)
TOYOTA SUPRA (1986 - 1992)
TOYOTA VAN (1984 - 1989)

Andrew · Aug 31, 2013

Bump for info that was useful to me. Not sure if this ever made it into the stickies, but if not it should.

Main relay

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