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FJR Motorcycle Forums
Technical & Mechanical Problems
no start
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<blockquote data-quote="ionbeam" data-source="post: 128169" data-attributes="member: 277"><p>Sorry to hear about your TPS! Glad that your dealer ID the problem and fixed it.</p><p></p><p>A bad throttle position sensor is not supposed to PREVENT starting but it can CAUSE a no start. When the throttle is sitting on the idle stop, as in the throttle grip is not being turned, the TPS is supposed to send ~.620 to .720 volts to the ECU. If the TPS is defective in the idle area it can return much less voltage to the ECU -- in the case of my bike, when hot at idle it can send as little as .270 volts to the ECU. This causes the ECU to set RPMs too low to allow the engine to start or run. If you had turned the throttle up a bit and cranked the engine there is a high probability it would have started.</p><p></p><p>There have been several TPS threads in the past and a couple of current threads in the Technical/Maintenance section. Unfortunately it is beginning to look like the TPS is having a pretty high failure rate in older bikes. :angry:</p></blockquote><p></p>
[QUOTE="ionbeam, post: 128169, member: 277"] Sorry to hear about your TPS! Glad that your dealer ID the problem and fixed it. A bad throttle position sensor is not supposed to PREVENT starting but it can CAUSE a no start. When the throttle is sitting on the idle stop, as in the throttle grip is not being turned, the TPS is supposed to send ~.620 to .720 volts to the ECU. If the TPS is defective in the idle area it can return much less voltage to the ECU -- in the case of my bike, when hot at idle it can send as little as .270 volts to the ECU. This causes the ECU to set RPMs too low to allow the engine to start or run. If you had turned the throttle up a bit and cranked the engine there is a high probability it would have started. There have been several TPS threads in the past and a couple of current threads in the Technical/Maintenance section. Unfortunately it is beginning to look like the TPS is having a pretty high failure rate in older bikes. :angry: [/QUOTE]
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FJR Motorcycle Forums
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