whipflash191
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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>
Hi Marcel,
Ive already traced the wire through the wiring diagram. It does directly from the D2 Pin on the ECU to the main relay and does not branch anywhere else. Ive confirmed its the main relay as all the relays match the wiring diagram from the service manual exactly however the relay never clicks. Ive tried grounding it and providing power to it and other pins on the relay but no dice. From my understanding I should expect this relay to click when the kill switch is off?
As to the bike turning over, it turns over happy and healthy just no spark. There is also power to the coils. The fuel pump does try to prime when the when the killswitch is flipped however like so many others from this year model, the outlet on my fuel pump housing has cracked off and I have yet to find a replacement that isn’t $300 from Korea. It was my understanding however that this should not affect spark.
I appreciate the advice! I haven’t gone over the whole harness yet but did go and test individual components after giving it a clean. I definitely think the pin for the starter relay system on the ECU is being bypassed. It would explain why I get the ‘che’ message on the display regardless of what position its in since the ecu isn’t getting a signal when the kill switch is used without it.
In regards to the ignition system, resistance wise the ignition coils checked out okay but I’ll probably replace them anyway. Stator is out of spec at 0.8ohm instead of 0.2-0.4ohm. Similarly, the pickup coil is out of spec at 182ohm instead of 110-140ohm so I think both are toast. The pickup coil does send voltage out of the connector but it i couldn’t observe go higher then 009.7mv which as far as I’m aware isn’t enough voltage to do anything worth a damn. Rectifier checked out okay but its been sitting outdoors for God knows how long and has some corrosion on the outer casing so I’ll replace it too.
I’ll be going with cheap replacements for these components for now, its not ideal but budget wise it works and it’ll do to verify that impossible to find ECU isn’t completely cooked before flashing the cash on better replacements.
It is in fact a daewoo ECU annnnd apparently it awful condition. If i’ve followed the diagram right i think the broken pin is D3 for the brake lights (which don’t work so that would make sense). I’m sure this is done for but im going to try and clean the connector and pins anyway and see where I get. Couldnt get worse at this point could it?
EDIT: I was infact reading the wrong wiring diagram for the GT not the GV. This pin should go to the starter relay, clutch switch and ‘filter’. Bike cranks though, a previous owner has spliced 12v into the harness and I’m guessing it was to bypass this and get the starter relay going.
