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Here is the piece that fries, I had one fixed by my electronic guru.I forgot where in this pic the part was from, I will try to find a better pic of the fried part insitu
Let's see if I can answer so far.With the ECU that is having the TPS voltage issue. The bike will run on the center stand, it will not idle. It will run on open throttle above idle. I do not think it will run down the road. So everything SEEMS to be working except TPS voltage. As in the ECU is not getting the throttle position value. Yes, that sounds to me like the TPS reference Voltage might not be there, as you open the throttle you don't get more Voltage so of course you don't get any more fuelMeasure the Voltage across the TPS I think it will be 5 Volts, if your other one works compare the two.Print out page 26 of the document I sent it shows where the Voltage originates, if you have a Guzzi schematic it might show you a little different. TPS was tested with a Caspers break out cable. Unplug the bike cable to TPS, plug into Casper cable, plug Casper cable into TPS. Casper cable has an extra set of wires to connect a multi meter to.Kiwi: To be clear, are you saying that you can pull the rubber cover back from the ECU main connector to measure the voltage? As in, pull boot, turn key on with ECU connected to cable, measure from the pins?? Yes, you should be able to slide the cover off the ECU plug, I mean the one attached to the loom at least I could on my 98 EV (may have to remove a couple of screws) then its really easy to touch your meter on the different connections (Loom side, not ECU side) I think your Casper cable does the same thing.Tom
Here is the piece that fries, I had one fixed by my electronic guru.
I did not cause the fault, I got the bike that way so not sure what caused the rectifier to burn. When I worked at the TV station we had a few genius electrical minds there, it was an easy fix for my friend Tom Z.. we identified the fried part by a little burn /black area around it on the board.
Could it be a bad TPS? Kiwi_Roy, you seem to know a lot about electric stuff, any guesses?
I do not think the TPS is bad. It was fine when I originally checked the voltage.This all started when I tried to connect my cables for Guzzidiag. As mentioned previously, at some point while moving the wiring around I saw a spark. I don't know what wire sparked to the positive terminal of the battery. OR, if it was while I connected the Guzzidiag cable to the diag. cable on the bike. I wish I could remember which it was.Tom
I suppose you switched the red and black connections to the battery. Happens more.
Fotoguzzi yes that looks like the one I found too, both the cards I fixed had a blown diode, I'm not sure why it blows perhaps far too much current.I'm not sure its the one on lower right though, that looks more like the coil driver area.I think Tom might have blown the Voltage reference on his
Typically "protection" diodes are zener diodes that will collapse if a certain voltage is applied to the cathode (non conducting stripe end) or short out and cook themselves if positive power is applied to the anode. They are typically placed across the +- of the power supply to protect upstream components and will draw enough current to pretty much instantly short them out if one of the two conditions is met.Easy ----------------------------------
I can not do voltage testing right now. I can only do bench testing.I have 3 ECU's to work with. 2 have the TPS issue and one has the no fuel pump issue.I did some testing today with pin 10, the ground for the ECU relay. The results were confusing. The only thing I did find that was not confusing, was that on the ECU with no fuel pump, pin 10 is not connected to the diode. As in the circuit board has an issue. The other two both read continuity from pin 10 to the same leg of the diode.I need to go back and test things again with another meter. I could swear that the meter is not reading at times, even though I remove the wires and test something else and it works. Yes, I'm doing my best to make sure I have good connections to make the reading.Thank you,Tom