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FJR Motorcycle Forums
Technical & Mechanical Problems
Anatomy of Gen III Fly By Wire TPS
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<blockquote data-quote="ionbeam" data-source="post: 1335495" data-attributes="member: 277"><p>As mentioned at the beginning of the autopsy, the Gen III TPS tested good in every way when sitting on my bench. Just like the TPS that came out of my Gen I. I only found my Gen I TPS by putting a volt meter on the sensor, putting the DMM on my handlebars and going for a ride. It was the heat and vibration of the ride that clearly showed the TPS voltage dropping from 0.900 volts to 0.300 volts then bouncing back up to 1.20 volts in sync with a horrible engine response that showed it was the culprit causing the dirveability issue.</p><p></p><p>It was clear what was happening when I opened up that TPS. The Gen III TPS looks the same as far as the resistor material being cut and burned.</p><p></p><p>The only good thing about troubleshooting the TPS is the very consistent failure <em>symptom</em> when riding. As you accelerate the voltage climbs, the ECU reads that and provides appropriate fuel injection and spark timing then suddenly the voltage drops to 1/2 idle causing the fuel to be cut off (instant deceleration), then the wiper advances back into good resistor material and like a light switch the fuel injection goes from below idle to 40% throttle. BANG (or is it BAM?). It happens so quickly that the decel/accel may not be obvious but the event feels major bad.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 1335495, member: 277"] As mentioned at the beginning of the autopsy, the Gen III TPS tested good in every way when sitting on my bench. Just like the TPS that came out of my Gen I. I only found my Gen I TPS by putting a volt meter on the sensor, putting the DMM on my handlebars and going for a ride. It was the heat and vibration of the ride that clearly showed the TPS voltage dropping from 0.900 volts to 0.300 volts then bouncing back up to 1.20 volts in sync with a horrible engine response that showed it was the culprit causing the dirveability issue. It was clear what was happening when I opened up that TPS. The Gen III TPS looks the same as far as the resistor material being cut and burned. The only good thing about troubleshooting the TPS is the very consistent failure [I]symptom[/I] when riding. As you accelerate the voltage climbs, the ECU reads that and provides appropriate fuel injection and spark timing then suddenly the voltage drops to 1/2 idle causing the fuel to be cut off (instant deceleration), then the wiper advances back into good resistor material and like a light switch the fuel injection goes from below idle to 40% throttle. BANG (or is it BAM?). It happens so quickly that the decel/accel may not be obvious but the event feels major bad. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Anatomy of Gen III Fly By Wire TPS
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