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FJR Motorcycle Forums
Technical & Mechanical Problems
Rough idle and ECU codes 11 & 12
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<blockquote data-quote="jblanken64" data-source="post: 1340099" data-attributes="member: 79430"><p>I've done quite a bit of forum searching already, but haven't found a definitive answer yet.</p><p></p><p>A little over a month ago, my bike (2008) developed a rough idle once warmed up. I've run Sea Foam, and injector cleaner through it, changed to premium gas and non-ethanol gas, changed the oil (because it was time anyway), changed the plugs, and inspected a bunch of connectors so far (focused on ECU connector since I've read that some corrosion can develop). I've run a bunch of the ECU diags and everything seems right, particularly the TPS which was initially assumed to be a possible culprit. Even though the check engine light has never come on, last night I noticed that codes 11 and 12 are in the ECU. Those are cylinder ID sensor and crankshaft position sensor failures. I didn't have time last night to track down those particular sensors to check the connections and ohm them, but maybe this evening I'll get to that.</p><p></p><p>Any other ideas? I've read that everything from a bad battery to dirty injectors can cause this type of symptom, but for every post ID'ing a cause someone else discounts it. The bike has been bulletproof until just recently. The local Yamaha shop didn't have any concrete advice other that the path I'm currently taking. They said they never have to work on FJR's outside of tires and fork seals.</p><p></p><p>Thanks in advance,</p><p></p><p>Joey.</p></blockquote><p></p>
[QUOTE="jblanken64, post: 1340099, member: 79430"] I've done quite a bit of forum searching already, but haven't found a definitive answer yet. A little over a month ago, my bike (2008) developed a rough idle once warmed up. I've run Sea Foam, and injector cleaner through it, changed to premium gas and non-ethanol gas, changed the oil (because it was time anyway), changed the plugs, and inspected a bunch of connectors so far (focused on ECU connector since I've read that some corrosion can develop). I've run a bunch of the ECU diags and everything seems right, particularly the TPS which was initially assumed to be a possible culprit. Even though the check engine light has never come on, last night I noticed that codes 11 and 12 are in the ECU. Those are cylinder ID sensor and crankshaft position sensor failures. I didn't have time last night to track down those particular sensors to check the connections and ohm them, but maybe this evening I'll get to that. Any other ideas? I've read that everything from a bad battery to dirty injectors can cause this type of symptom, but for every post ID'ing a cause someone else discounts it. The bike has been bulletproof until just recently. The local Yamaha shop didn't have any concrete advice other that the path I'm currently taking. They said they never have to work on FJR's outside of tires and fork seals. Thanks in advance, Joey. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Rough idle and ECU codes 11 & 12
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