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FJR Motorcycle Forums
Technical & Mechanical Problems
Wideband O2 sensor
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<blockquote data-quote="jammess" data-source="post: 1374254" data-attributes="member: 89387"><p>And now the rest of the story. It doesn't work connecting the black/blue wire (floating ground) to ground because doing so screws up the other sensor inputs to the ECU which causes the bike to not idle well at all in open loop with much sputtering and occasionally dyeing. The LC-2 uses battery negative for common and just no way around that. Long and short is if you can't connect the floating ground to ground the ECU sees an open circuit where the O2 sensor is concerned. IF you ground the black/blue wire all is well above idle in closed loop. I see no way around the ground issue. I even tried a ceramic capacitor between the floating ground and ground and again no joy. Maybe Yamaha uses this floating ground to isolate the ECU from stray electrical noise on the sensor inputs, who knows.</p><p></p><p>I guess I have a spare LC-2 with wideband O2 sensor for my BMW.</p><p></p><p>For what little its worth I know when the FJR goes closed loop and I know when the CO adjustments come into play.</p></blockquote><p></p>
[QUOTE="jammess, post: 1374254, member: 89387"] And now the rest of the story. It doesn't work connecting the black/blue wire (floating ground) to ground because doing so screws up the other sensor inputs to the ECU which causes the bike to not idle well at all in open loop with much sputtering and occasionally dyeing. The LC-2 uses battery negative for common and just no way around that. Long and short is if you can't connect the floating ground to ground the ECU sees an open circuit where the O2 sensor is concerned. IF you ground the black/blue wire all is well above idle in closed loop. I see no way around the ground issue. I even tried a ceramic capacitor between the floating ground and ground and again no joy. Maybe Yamaha uses this floating ground to isolate the ECU from stray electrical noise on the sensor inputs, who knows. I guess I have a spare LC-2 with wideband O2 sensor for my BMW. For what little its worth I know when the FJR goes closed loop and I know when the CO adjustments come into play. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Wideband O2 sensor
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