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First Generation Legend (1986-1990) Discuss the 1st Generation Honda/Acura Legend (US 8

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Old 07-13-08, 03:28 PM   #1 (permalink)
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Main Relay Repair DIY

The main relay is a common weak point for all late 80s/early 90s Honda vehicles, and the Legend is no exception. The symptoms are presented on http://techauto.tripod.com/ and the solutions are http://techauto.te.funpic.org/solutions.php. This is a DIY tailored specifically to Legend G1s.

When the main relay was originally assembled, too little solder was used on the circuit board, and after years of hot and cold cycles, the solder developed tiny cracks, resulting in a no-start situation because the fuel pump does not receive a signal turn on. The problem typically presents itself on very hot days, especially after the car has been recently run. This DIY shows how to repair the main relay in as little as 30 minutes. Even if your car has yet to show the symptoms, it is so easy to do, I would recommend it as a preventative measure.

Tools:
Phillips Screwdriver
Soldering Iron
Solder

1. First, remove the two lower panel screws and disconnect all four electrical connectors.


2. Remove the two vent screws. The main relay can now be seen by looking straight up around the location of the clutch pedal (this is even easier if you have an auto).


3. This is the main relay. Remove the electrical connector. Next is the hardest part because of the location of the relay but is so much easier thanks to KAHRuzer's suggestion to remove the innards instead of the entire main relay itself. The innards are held in to the outer black case by two tabs. Press back the unseen tab and pull down on the brown part of the main relay. Now do the same with the other tab and pull the brown innards out of the case. This takes a little patience but is so much easier than finding a way to get to the screw that's on top of the main relay's black case.


4. These are the "innards" of the relay and the solder tools you'll need. If you look very closely, you'll see some minuscule cracks in the solder, especially around the connections that have very little solder to begin with (http://techauto.te.funpic.org/images...ydryjoint.jpg). I have very little soldering experience (I just bought my first solder iron for this task... $13.99 at Home Depot) but this board was very easy to solder with a little patience. Simply add solder to all the connections that appear to need it (I added to 10-15 of the connections)


5. Here is the repaired relay. Installation is very simple and is the reverse of removal.


Let me know if you have any questions!
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Old 07-13-08, 06:46 PM   #2 (permalink)
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nice! i did the same but i removed all the old solder
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Old 07-13-08, 07:12 PM   #3 (permalink)
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Quote:
Originally Posted by Legend V6 View Post
nice! i did the same but i removed all the old solder
Yeah, I suppose that would be the proper way to do it but I didn't have a solder remover tool. However, the old solder melted and combined with the new solder to seal up any cracks.
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Old 07-29-08, 06:04 PM   #4 (permalink)
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Excellent Thread. It should be in the G1 DIY section. Nice pics. Thanks
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Old 07-29-08, 10:14 PM   #5 (permalink)
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Old 07-30-08, 03:25 PM   #6 (permalink)
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I'm clicking on the DIY link on the top and it says there are no DIYs. Is there another DIY section?
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Old 07-30-08, 05:46 PM   #7 (permalink)
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Old 09-05-08, 08:52 PM   #8 (permalink)
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is this from the legend? mine has an air duct going right over/under it.
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Old 09-05-08, 11:43 PM   #9 (permalink)
FRISCO LEGEND BABY!!!!
 
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Quote:
Originally Posted by tubadude View Post


is this from the legend? mine has an air duct going right over/under it.
Look at pic #2.
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Old 09-06-08, 12:22 AM   #10 (permalink)
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^toshay. i didnt remove mine. not really needed for access. just made it a tad harder to find.
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Old 01-17-09, 08:54 PM   #11 (permalink)
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I dont suppose any one has a clear picture of the writing on the black plastic relay cover?
The legend at the wreckers near me is missing its main relay, and i want to see if i can find a replacement one form another honda of similar vintage (maybe a prelude).
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Old 01-17-09, 09:31 PM   #12 (permalink)
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I think the part you need is a 7-pin Mitsuba RZ-0063 main relay.
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Old 01-17-09, 09:39 PM   #13 (permalink)
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I think all Honda and Acura use the same Main Relay.
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Old 01-17-09, 10:52 PM   #14 (permalink)
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when i was at the wrecker i pulled a main relay from an 88-89 honda prelude (just in case).
Not sure if it will work now tho.
Its a:
"MITSUBA
RELAY ASS'Y MAIN
RZ-0081 12V
japan"
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Old 01-18-09, 02:57 PM   #15 (permalink)
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Quote:
Originally Posted by scythe View Post
when i was at the wrecker i pulled a main relay from an 88-89 honda prelude (just in case).
Not sure if it will work now tho.
Its a:
"MITSUBA
RELAY ASS'Y MAIN
RZ-0081 12V
japan"
These main relays Honda utilize have different RZ #'s... it should work just fine!
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