 Relay board troubles, Power here and here but not there! |
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| dinomium |
 Mar 28 2004, 12:00 AM
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#1
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Git on a chair son, all the good stuff is goin over yer head!  Group: Benefactors Posts: 2,777 Joined: 2-January 03 From: Bremerton, WA Member No.: 74 Region Association: Pacific Northwest   |
Grrrr! Ok, when I jump across from pin 30 to 87, I have power to the fuel pump lead. There is 12+ volts at pin 30 AND pin 85. I have tried at least 10 relays, and they work for the fan socket. There is no signs of melting and just a little cracking in the "goo" underneath the board itself.
Is there some other "trigger" in the circut that I am missing? I have printed out the wiring diagams (color even) and am slowly going MAD I TELL YOU MAD!!! (IMG:style_emoticons/default/headbang.gif) If anybody has a fault method they would like to share with me? (IMG:style_emoticons/default/confused24.gif) Or even better, a work around that I can use for this weekend to move past this issue? I promise to order a rebuilt board later this week. Jet D 1974 converting from a 1.8 carbed application to a 2.0 fuel injection. Trying to use stock wiring. Not too badly "skunked" by the PO Thanks |
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| SirAndy |
Mar 28 2004, 01:03 AM
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#2
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Resident German Group: Admin Posts: 41,625 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
ok, so ...
- you got 12V at pin 30 very good! that means the fuse and everything is OK. - the pump runs when you jump pin 30 to pin 87 very good! that means the wiring to the fuel pump and the pump itself is OK. so the problem is either the trigger current itself OR the relay socket. are the pinholes corroded? they tend to do that. (IMG:style_emoticons/default/wink.gif) there is 2 possible triggers: pin 85 is triggered by pin 87 from the power-supply relay (the one above) which in turn also provides power to the FI brain. pin 86 is triggered by the FI brain circuit. pin 85 turns on the pump as soon as you turn on the key and the brain will shut it off after a few seconds unless you start up the engine, in which case it'll run continuesly (sp?). sooooo, as soon as you turn on the key, you should see something (current) on pin 85. if not, check the power-supply relay. the trigger for that comes off the same connection as the trigger for the heater fan relay, sooo, if the heater fan works as soon as you turn on the key, the trigger for the power-supply relay works. (IMG:style_emoticons/default/wink.gif) if you do get the current, the brain might shut off the relay immediately (instead of the normal delay) and might keep the relay open. do you have a spare brain to test with? hope that helps a bit, Andy (IMG:style_emoticons/default/drunk.gif) |
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| dinomium |
Mar 28 2004, 01:28 AM
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#3
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Git on a chair son, all the good stuff is goin over yer head! Group: Benefactors Posts: 2,777 Joined: 2-January 03 From: Bremerton, WA Member No.: 74 Region Association: Pacific Northwest |
why IF I had a spare brain... I do have a known good unit on another yard art car. Thanks Andy, that is exsactly what I needed to know.
(IMG:style_emoticons/default/wacko.gif) |
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| dinomium |
Mar 28 2004, 11:48 PM
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#4
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Git on a chair son, all the good stuff is goin over yer head! Group: Benefactors Posts: 2,777 Joined: 2-January 03 From: Bremerton, WA Member No.: 74 Region Association: Pacific Northwest |
IT IS ALIVE!
Thanks Andy for the help! I changed the brain and all the relays, and vaaaaaaaarooooommm!!! (IMG:style_emoticons/default/aktion035.gif) Now on to brakes and other thsings! |
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| Bleyseng |
Mar 29 2004, 09:00 AM
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#5
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Way to go Dino.
Be sure to match the FI parts with the running ECU. You must use the correct CHT,MPS, with the ECU that works or the idle won't work and you could run lean. Check the numbers at BradAnders site: http://www.members.rennlist.com/PBanders/ |
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| dinomium |
Mar 29 2004, 11:39 AM
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#6
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Git on a chair son, all the good stuff is goin over yer head! Group: Benefactors Posts: 2,777 Joined: 2-January 03 From: Bremerton, WA Member No.: 74 Region Association: Pacific Northwest |
Yes, I will. I still need to sort out the vac hoses and mount stuff. I am stoked that I can put the wheels back on tonite and roll it out of the Garage! It has been a Long time inside! All new gas is need too.
Cheers, |
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