...so when you get 9.5v from the ecu, is this making it all the way to the fuel pump connector? Doesn't really matter at the moment what leaves the ECU if it's not making it all the way to the pump.
Where are you measuring the above highlighted voltages?hey guys got a 98 that will not cycle the fuel pump. ....and now the bike will run only if the fuel pump relay is jumped. I checked for voltage on the wire going to the ecu but as the ecu cycles the pump for 3 seconds the voltage is only 9.5 but i have 12.5 at the battery. .....also got another ecu. but unfortunately the one he got will not cycle the pump also. i tested it and only get 1.5 volts going to ground threw the ecu. so i am assuming this one it toast to. .....
That is correct. :yes That is why I noted that the ECM which is driving the Yel/Blu wire down to 1.5V is probably OK. That leaves about 9 to 10 volts dropped across the relay's coil which should be enough to activate it. If it is not activating, there is either resistance in the Org/Wht wire upstream from the relay, or the relay is bad.......
In a nutshell - Y/B wire low = FP runs; Y/B wire high = FP is off.
If the Yellow/Blue wire stays high all the time, the FP relay will not engage.
With notes from D'Ecosse and previous SRAD experience, you should be good to go. I'm surprised you even posted the question. :laughi have gone over most of the connectors on the bike cleaning and applying dielectric grease. but most of them look perfect. i used to have a 99 750 srad so i am familiar with suzuki connector issues lol
Then you might be interested in this thread. http://www.tlzone.net/forums/search.php?searchid=1156632 It is huge, but I'm pretty sure there are some photos of the exposed ECM board in there. :devious If not, there is still a bunch of technical info in it...... I was more curious if there was a actual surface mounted transistor that i could repair inside the ecu. i am in the process of stripping the silicon off one the ecu of the ecu the po bought to look at it, i am curious to see the motherboard anyway.