Date: Mon, 09 Jun 2003 21:25:03 GMT From: "John T. Slodyczka" <masniak2nopsamast.net> Subject: Re: 1987 9000S Blowing ECM HELP!!!!
I was thinking of doing that but not sure which wire exactly is causing it to blow then again couldn't hurt to do it on all of em. :) Any ideas as to what amperage to fuse em at? Like I said no diagram makes it hard to calculate these things. Once again thanks for the ideas and prompt help, John "darkpoter" <darkpoternopsamail.com> wrote in message news:j12Fa.9523$945.27544nopsamnn1.netcom.ca... > You could always splice in a breaker/diode for now to prevent it from frying > the ecu eevry start... > Might make trouble shooting less expensive. > > > Matt > "John T. Slodyczka" <masniak2nopsamast.net> wrote in message > news:_gJEa.880862$OV.821969nopsamnsc54... > > I just put in the old ECU that i had fixed up (burnt track on the circuit > > board that i jumpered and a bad chip). When I put it in, the fuel pump > > started for a little bit then quit and smoke was billowing out of the ECU. > > When I took it out and examined it, I found that it burnt the track > further > > along (i jumpered that bad part with 22 awg last time) and completed > frying > > the bad chip. All this leads me to believe (due to simple electrical > > theaory, once again not familiar with electronics) that there is still a > > short somewhere in the system. Or is it that the bad chip (didn't fix it > > cause didn't have another) caused the further frying , though the pump did > > work for a little bit. What do you think? I'm almost at the point of just > > taking and examining every inch of that wiring harness. > > > > thanks in advance, > > > > John > > "KeithG" <noonenopsamspring.com> wrote in message > > news:3EE33BC8.6030605nopsamspring.com... > > > The way the system works is that the ECM (ECU) pulls down a ground on > > > the fuel pump relay which feeds a 12V source to the fuel pump. This > > > should run the fuel pump. Now, I think the LH2.2 ECU that you have (I am > > > not too sure) requires a pulse train indicative of ignition before it > > > will pull down the ground on the fuel pump relay. > > > > > > It could also be the fuel pump itself. When it is cranking, does the > > > tack needle wiggle? If so, you have an ignition pulse train. See if the > > > ground is supplied to the fuel pump relay (Pin '86' I think) while it is > > > cranking. ( This may indicate a need for an ECU, but these are very > > > robust - also check to see that the ECU relay gets 12V to the ECU) If > > > so, then check to see if pin 87 on the relay is getting a 12V signal. > > > (If not, you need a fuel pump relay). Then check for that at the fuel > > > pump itself. (If so, you need a new fuel pump). > > > > > > Check the www.townsendimports.com website for technical documentation on > > > the electrical system as well. > > > > > > Keith > > > > > > MarkC wrote: > > > > I've got a 87 9000S (I'm much more in love with my Classic 900 though) > > > > but I just got it so I'm not that familiar with it. Try doing a Google > > > > search on 'saab ecm' > > > > (I just did & got 295 hits). Also try the saab.net. It would also be a > > > > good idea to get a service manual so check your library. Instead of > > > > taking it to a dealer try to find a competent (via referrals) > > > > independent import auto repair shop > > > > (which you can do by posting here or at saab.net). You could take it > in > > > > for an estimate & then fix it yourself after they tell you what's > wrong > > > > with it (sometimes this doesn't work because they won't divulge all of > > > > the details). > > > > Mark > > > > > > > > > > > > "I really love this saab that I received for near nothing with the > > > > condition that the fuel system is not running and and if i can fix it > > > > its mine. Let me reiterate that I love this car. But alas, as for most > > > > people money is a problem so I would prefer not going to a dealer if I > > > > don't have to. I though I had the problem licked when I found some bad > > > > insulation on some wires and respliced them. BTW I am an electrician > so > > > > I am proficient with a tester but I do not know much about electronics > > > > and I do not have/cannot find electrical diagrams to this car. Anyway, > I > > > > got a new ECM plugged it in got the fuel pump working actually got the > > > > car to start and while it was running, all of the sudden, the fuel > pump > > > > stopped running and the car died immediately. This leads me to believe > > > > that I fried the new ECM. Now my question is, should I be looking for > > > > more bad wiring possibly in the fuel pump and/or injector circuits or > > > > could this be the fault of a bad sensor or whatnot? The reason I ask > is > > > > that the car was running for a little bit before it just stopped > > > > suddenly so i'm not sure if some sensor or relay or something kicking > in > > > > didn't cause the sudden burn-up. Any and all help will be greatly > > > > appreciated. > > > > Thanks in advance for the help, > > > > John" > > > > > > > > > > > > > > > > > > > > > > > > >
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