Date: Mon, 09 Jun 2003 21:23:41 -0400 From: KeithG <noonenopsamspring.com> Subject: Re: 1987 9000S Blowing ECM HELP!!!!
Hmmm. how you are 'frying' the hybrid circuit is a mystery to me. 1) do you get 12V and ground where you are supposed to? Does the fuel pump relay get proper voltage? If you jumper the relay (bypass it) does the car run? Make sure that you re not using the ECU to run the pump, but rather only to close the relay. Did the townsend motors site provide any help? KeithG darkpoter wrote: > 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. >>>
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