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FJR Motorcycle Forums
Technical & Mechanical Problems
Continued TPS Failures
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<blockquote data-quote="ionbeam" data-source="post: 886840" data-attributes="member: 277"><p>Just a quick response. Do remove the PC-3 to confirm that it is unrelated to the driveability problem.</p><p></p><p>The PC-3 should be 100% independent of the TPS in all ways unless someone were to have tapped the TPS wires for power or ground. The TPS wires should NEVER be tapped for anything because it is an isolated 5 VDC reference circuit coming from the ECU.</p><p></p><p>Take a look at the <a href="https://www.fjrforum.com/forum//index.php?showtopic=12074&view=findpost&p=148013" target="_blank">anatomy</a> of the TPS, it is just a simple potentiometer. There is nothing that that should electrically kill it. There is nothing mechanical that should harm it. The early TPS had issues with the durability of the resistor material causing erroneous readings to the ECU in very narrow rpm bands, regardless of gear. Do your driveability problems happen in a very narrow rpm range? And to repeat my first info request, is it heat related?</p><p></p><p>The only way I can conceive of TWO bad TPS is that the replacement TPS was not the new design. The only other way I can possibly see is if the throttle shaft was bent causing nutation of the wiper in the TPS.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 886840, member: 277"] Just a quick response. Do remove the PC-3 to confirm that it is unrelated to the driveability problem. The PC-3 should be 100% independent of the TPS in all ways unless someone were to have tapped the TPS wires for power or ground. The TPS wires should NEVER be tapped for anything because it is an isolated 5 VDC reference circuit coming from the ECU. Take a look at the [URL="https://www.fjrforum.com/forum//index.php?showtopic=12074&view=findpost&p=148013"]anatomy[/URL] of the TPS, it is just a simple potentiometer. There is nothing that that should electrically kill it. There is nothing mechanical that should harm it. The early TPS had issues with the durability of the resistor material causing erroneous readings to the ECU in very narrow rpm bands, regardless of gear. Do your driveability problems happen in a very narrow rpm range? And to repeat my first info request, is it heat related? The only way I can conceive of TWO bad TPS is that the replacement TPS was not the new design. The only other way I can possibly see is if the throttle shaft was bent causing nutation of the wiper in the TPS. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Continued TPS Failures
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