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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle position sensor
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<blockquote data-quote="ionbeam" data-source="post: 38045" data-attributes="member: 277"><p>Ratman didn't give a full description of his problem. Basically, when cruising around 3k rpm his engine feels like it quits running for a fraction of a second then abruptly starts again with rude consequences for the rider.</p><p></p><p>Abrupt changes are usually electrical in nature. Typically this kind of symptom would have you looking at the ignition and main power sources. In this case it is strongly associated with a narrow RPM range. This makes it more likely to be sensor based than a loose connection. The TPS is the most likely culprit as it has a proven record as being unreliable and often fails with this kind of symptom. I think Ratman's FJR has ~27k miles so this is likely. If a careful test of the TPS shows no problem then it is time to look at the FP regulator. If the ECU sees a sensor such as air temp or intake pressure go out of range it should set a code and use a default value. The rider probably wouldn't even notice. Ratman's service shop found no codes. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite24" alt=":unsure:" title="Unsure :unsure:" loading="lazy" data-shortname=":unsure:" /> </p><p></p><p>Before we go off the deep end we need to find out the results of Ratman's TPS testing.</p><p></p><p>Alan</p></blockquote><p></p>
[QUOTE="ionbeam, post: 38045, member: 277"] Ratman didn't give a full description of his problem. Basically, when cruising around 3k rpm his engine feels like it quits running for a fraction of a second then abruptly starts again with rude consequences for the rider. Abrupt changes are usually electrical in nature. Typically this kind of symptom would have you looking at the ignition and main power sources. In this case it is strongly associated with a narrow RPM range. This makes it more likely to be sensor based than a loose connection. The TPS is the most likely culprit as it has a proven record as being unreliable and often fails with this kind of symptom. I think Ratman's FJR has ~27k miles so this is likely. If a careful test of the TPS shows no problem then it is time to look at the FP regulator. If the ECU sees a sensor such as air temp or intake pressure go out of range it should set a code and use a default value. The rider probably wouldn't even notice. Ratman's service shop found no codes. :unsure: Before we go off the deep end we need to find out the results of Ratman's TPS testing. Alan [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle position sensor
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