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Date: Sun, 08 Jun 2003 16:00:31 GMT
From: "John T. Slodyczka" <masniak2nopsamast.net>
Subject: Re: 1987 9000S Blowing ECM HELP!!!!


thanks a million i'll check around like you said. Having a scematic would make my life much simpler. Thanks, 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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