Hi Fellas, hoping someone can give me some advice. On my last ride I was flying along the freeway at 70MPH, enjoying the sweet sweet sounds of my GTM 2 into 1 exhaust. Suddenly and without any warning the bike just died. No cough, no sputter, just flat shut off. Towed it home and begun the diagnosis. Here's what I've found:
The 5 amp fuse to the ECU is blown. Put another 5 amp in and it immediately blew, with the bike off (key not even in it). Consulted the wiring diagram and it looks like that fuse gets 12VDC from the voltage regulator. Checked that side of the fuse and sure enough there's continuity to battery +. The downstream side of the fuse goes to a pull-up resistor and to the ECU. This side of the fuse is shorted straight to chassis ground. Doh! Pulled the main ECU connector and the short to ground goes away. Soooooo, blown ECU with internal short to ground?
The 5 amp fuse to the ECU is blown. Put another 5 amp in and it immediately blew, with the bike off (key not even in it). Consulted the wiring diagram and it looks like that fuse gets 12VDC from the voltage regulator. Checked that side of the fuse and sure enough there's continuity to battery +. The downstream side of the fuse goes to a pull-up resistor and to the ECU. This side of the fuse is shorted straight to chassis ground. Doh! Pulled the main ECU connector and the short to ground goes away. Soooooo, blown ECU with internal short to ground?