GV650 Daewoo CHE
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Bike Model = : 2010 GV650
Hi all,
I could use some advice on this one. Ive been working on a Daewoo GV650 and honestly it was going pretty great with just the injectors giving me trouble however in the course of my troubleshooting I broke the fuel outlet and needed a replacement.
I plugged in the replacement today and turned the ignition and wouldn’t you know it all of a sudden the boke does a whole lot of nothing. It cranks but that’s about it. The relay clicks when you move the killswitch but the ecu doesnt engage and stays on Che with no power to the fuel pump. The 15 and 30amp Fuses pass a continuity check and seem okay. I tried another ecu on hand that is busted BUT does have the predictable behaviour of engaging the fuel pump when you hit the killswitch switch.
The bike was having an issue with the ISC Solenoid making some God awful noises before this but I dont see any indication in the service manuals that a dead ISC would stop the bike the like this. I did try another unknown condition ISC from a parts bike with no change.
Any advice in what to chase down next would be appreciated. I dont believe and am hoping its not the ECU. I got incredibly lucking finding this one as it is.
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Daewoo pumps run at a different pressure rating, did you swap the internals of your OLD pump in to the new plastic shell of the new pump ?
And retry? Also if possible , check if there is a 12v pulse coming from the pump wires when you turn the bike on ? (this is what turns the pump on to prime, so its a wire / signal check)
As you had the bike apart, you want to use only dry air , and blow the connectors clean for every plug you find on the bike. I would not even think twice to put liquids near the ecu ,as you said, you would have to go in hell to even find another Daewoo ECU again, so i too hope it is not that either.
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Hey Marcel,
<p style=”text-align: center;”>Ive tried some known good pumps and no luck. I THINK the bike might have killed a ground somewhere. The connector to the fuel pump relay is definitely switching 12v over to pin 4 (measured between 1 & 4, orange & black) when you hit the killswitch. I do get ground from pin 1 & 3 (red and orange) to the battery ground but the relay never seems to pop. Neither does the Main Relay. Im hoping this isn’t ecu related and is a failure somewhere else.</p>
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Check the fuel pump connector even gets a 12v signal, just the fuel pump harness ?
If the pig-tail is dead, remove it, then measure the “main bike harness” itself before it connects to the “sub harness” of the fuel pump. Want to make sure all the wires from the pump down to the ECU is not broken ?
If the pump had a pink wire , i would trace it all the back to the ECU which i assume it should still be the same colour (Hyosung does change wire colors halfway down the harness! so verify with service manual book that has a wiring diagram at the last pages)
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