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FJR Motorcycle Forums
Technical & Mechanical Problems
New cruise control get flaky with time/miles
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<blockquote data-quote="ionbeam" data-source="post: 237999" data-attributes="member: 277"><p>If you don't find the problem with the vacuum system the next thing to check is the tach circuit including the DIP switches in the servo control unit. The way you describe the speed control petering out is a classic symptom of the tach circuit. Verify your Posi Tap (you done good with these!) connection to the coil wire. Verify that you haven't damaged the 'filter' that is in the AVCC tach wire. Confirm the switch settings in the servo unit:</p><p></p><ul> <li data-xf-list-type="ul">Set the Pulses Per Minute for manual transmission rate of 4000 -- set Switch 1 ON and Switch 2 OFF.</li> <li data-xf-list-type="ul">Set the Speed Signal for Tach Only -- Switch 3 OFF.</li> <li data-xf-list-type="ul">Set Sensitivity to LOW for light vehicles with high horsepower -- set Switch 4 ON and Switch 5 OFF.</li> <li data-xf-list-type="ul">When using the AVCC Control Pad -- set Switch 6 OFF.</li> <li data-xf-list-type="ul">Tach Source Select is for a coil connection -- set Switch 7 OFF.</li> </ul><p>If you don't find your problem with vacuum or the tach signal you might be looking at a bad servo unit, though I don't recall a bad servo ever being found to be the root cause.</p><p></p><p>The fact that the unit sets and controls to a point is a 'soft' failure, not a hard failure which is like turning a switch on/off. A soft failure says that the rest of your electrical connections are good because any failure of these would cause abrupt shut-off.</p><p></p><p>Good luck!</p></blockquote><p></p>
[QUOTE="ionbeam, post: 237999, member: 277"] If you don't find the problem with the vacuum system the next thing to check is the tach circuit including the DIP switches in the servo control unit. The way you describe the speed control petering out is a classic symptom of the tach circuit. Verify your Posi Tap (you done good with these!) connection to the coil wire. Verify that you haven't damaged the 'filter' that is in the AVCC tach wire. Confirm the switch settings in the servo unit: [LIST][*]Set the Pulses Per Minute for manual transmission rate of 4000 -- set Switch 1 ON and Switch 2 OFF. [*]Set the Speed Signal for Tach Only -- Switch 3 OFF. [*]Set Sensitivity to LOW for light vehicles with high horsepower -- set Switch 4 ON and Switch 5 OFF. [*]When using the AVCC Control Pad -- set Switch 6 OFF. [*]Tach Source Select is for a coil connection -- set Switch 7 OFF. [/LIST] If you don't find your problem with vacuum or the tach signal you might be looking at a bad servo unit, though I don't recall a bad servo ever being found to be the root cause. The fact that the unit sets and controls to a point is a 'soft' failure, not a hard failure which is like turning a switch on/off. A soft failure says that the rest of your electrical connections are good because any failure of these would cause abrupt shut-off. Good luck! [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
New cruise control get flaky with time/miles
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