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  #1  
Old 3 Weeks Ago
dr johnson dr johnson is offline
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Default P0505 code on my '09 XL883C driving me insane!!

I'm reaching out to as many eyes as possible in hopes of getting some good advice so my wallet doesn't get completely drained.

Here's the story; I have my 2009 Sportster (~10,000mi), V&H shortshots staggered, K&N air filter, and I got a V&H fuelpak to tune the bike because I bought it used in the spring and wanted to get the engine running right. After a couple months, I started noticing the engine revving high, typically while I was downshifting off the highway, after engine had warmed up. It's at a point where sometimes it feels like I have cruise control on cause the bike will be chugging right along without me rolling ANY throttle on. I'll be downshifting from 4th and anytime I pull the clutch, RPM's are up in the 2200-2500 range. It's become a complete nuisance that happens all the time now (after highway 4th gear driving...; city driving, engine seems to run normal), and pulls a P0505 code, however, the 'engine' light goes off and idle goes back to normal only after I've brought the bike to a complete stop. I could be rolling at 5 mph with the clutch pulled and the engine will be revving to death, but the second those wheels stop, boom, code pulled, light on/off, idle back to normal.

Since I've been able to connect my phone to the fuelpak and monitor the readings while driving, it's registering the TPS correctly, and seems to be accurately measuring engine temperature, two sensors I've heard may cause an issue. I've cleaned crank pos sensor. I followed steps in my manual, which had me check IAC pintle, which retracts when it's supposed to. Ive replaced all air intake gaskets to rule out vacuum leak on that end. I even had a Harley dealer check fuel pressure, which was normal. I figured since it was pulling a code, a dealer would've been able to find the problem, however since the light doesn't stay on, they basically sent me on my way, after paying for the labor of course. I've also returned the map to stock and been able to duplicate issue.

Do I just have a bad ECM? Am I destined to go back to the stealership and have them test all these sensors?! Reaching out to anyone else that may have experienced a similar issue, and can lend some advice and sanity. Thank you!!
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Old 3 Weeks Ago
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Default P0505 code on my '09 XL883C driving me insane!!

don’t think it is the ECM. your IAC motor is probably bad or dirty.

and yes, it only tries to reset when speed = 0, stupid ‘feature’ on ECU code to prevent engine stall when in motion or whatever.

also, check your throttle cables, esp. the return cable.
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Default

Here are other XLForum threads to review:
https://www.google.com/search?q=P050...te:xlforum.net

Make sure connector pins are solidly pressed into the connector housing - loose pins create intermittent/random problems...

You might try a full reset by removing the MaxiFuse...


Not directly related to this code, but it never hurts to make sure your battery wires are good & you have good grounds:
When you're having issues with the electrical system, use this Sportsterpedia section about
checking the battery cables, voltages and grounds - DO THIS BEFORE ANYTHING ELSE:
http://sportsterpedia.com/doku.php/t...place_to_start


And - You might want to check the CKP Sensor connector that is located under the bike - all kinds of crazy results can be seen from a faulty CKP Sensor or a bad connector (dirty, grimy, wet,etc.)...


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Last edited by IXL2Relax; 3 Weeks Ago at 18:05..
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generic test:

This should be a fairly straightforward diagnosis. Start by clearing the fault codes. Then unplug the IAC and start the engine (This may cause other IAC codes to set. Just ignore them for now). If the P0505 code doesn't reset, replace the IAC. It is internally shorting one of the IAC circuits. If the code DOES return after unplugging the IAC and starting the engine, then you know it isn't the IAC motor. Visually check the wiring harness all the way back to the PCM. You may need to visually inspect the harness by removing all the insulation off the wires. It is possible that the wires could be shorting to eachother or to other wires in the harness. If there are no wiring problems, and the code keeps returning with the IAC unplugged, you can check the PCM by removing the IAC wires from the PCM connector (or clipping the wires in a location where they can be repaired easily) and then start the engine (If you're not sure, don't do it. Take it to a qualified professional). Now if the code doesn't reset there is a problem with the wiring. Check for continuity on all the IAC wires. Any resistance points to a problem. Check for voltage on any(At this point there shouldn't be any voltages on the wires because they're clipped at one end and unplugged at the IAC). Repair as necessary. But if the P0505 code DOES reset after removing the IAC wires from the PCM connector (or clipping them), replace the PCM, there's a problem internally on the IAC control circuit.
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