P0506 (Idle Control System RPM Lower Than Expected) - Chevy Colorado & GMC Canyon
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post #1 of 21 (permalink) Old 10-22-2008, 12:33 AM Thread Starter
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P0506 (Idle Control System RPM Lower Than Expected)

Anyone experienced this before ? The truck is throwing the code, even after clearing it twice. Seems to idle absolutely normally, and a friend of mine told me that it might be a problem with my intake air control valve, although he was unsure if our trucks are even equipped with one of them.

Only other things that i thought of was to clean the throttle body and the mass airflow sensor... and also i need to change the oil.

...just hoping that someone could point me in the right direction with this problem, and yes i know i should take it to the dealership, but i don't have a warranty

thanks in advance for any thoughts

-jason

http://www.canada355.com/
2005 Black LS Extd. I5 Z85/2WD
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post #2 of 21 (permalink) Old 10-22-2008, 01:36 AM
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Re: P0506 (Idle Control System RPM Lower Than Expected)

Definitely clean the throttle body and MAF sensor. Then see if it still gives you the code after you clear it.


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post #3 of 21 (permalink) Old 10-23-2008, 06:37 PM
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Re: P0506 (Idle Control System RPM Lower Than Expected)

Yea, my 2004 displayed the code this morning. Cool front came through texas this morning with some moisture. Autozone computer indicated, 1-vacumn leak on engine, 2-dirty throttle body, 3-iac motor defective, 4-poor electrical connection to te IAC valve. What the heck is a IAC motor?

I gonna assume cool front for now, cleared code and will see what happens in the morning.

Any other ideas?
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post #4 of 21 (permalink) Old 10-23-2008, 07:37 PM
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Re: P0506 (Idle Control System RPM Lower Than Expected)

IAC stands for "Idle Air Control". I don't think our colorado's have an IAC motor. So you can eliminate #'s 3 and 4 in your post.
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post #5 of 21 (permalink) Old 10-23-2008, 11:51 PM Thread Starter
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Re: P0506 (Idle Control System RPM Lower Than Expected)

yep, first thing i heard to check for was the vacuum hoses.. and as we all know there are plenty of those, and it makes it difficult to pinpoint a leak unless you have a smoke machine. the least you can do is to check all the connections and visually inspect the hoses, worm clamps etc.

..i haven't had a chance to do anything yet, except reset the CEL... which has now came on again after a couple more warm up cycles.
I can notice the RMPs struggling a little bit now that i'm paying attention. never seems to dip under 500 though, but with my exhaust i can definitely notice a change of tone while idling

either way, when i have time.. i will clean the MAF sensor, throttle body, replace spark plugs, change fuel filter, and change my oil.

a combination of all these should eliminate the problem unless its a vacuum hose leaking... in which case it's most likely off to the mechanic.

also, i'm not sure if we have a IAC motor or not, but isn't the throttle plate in our throttle body controlled by some kind of motor?? possibly a malfunction with that... (shot in the dark)

-jason

http://www.canada355.com/
2005 Black LS Extd. I5 Z85/2WD
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post #6 of 21 (permalink) Old 10-24-2008, 10:27 PM
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Re: P0506 (Idle Control System RPM Lower Than Expected)

Actually, our engines don't have a lot of vacuum hoses. Check every connection on the air intake between the MAF sensor and the throttlebody. Spray some carb cleaner on each connection and see if the rpms change. If you still have the factory intake, check the plastic ducts and resonator for cracks. Don't forget to check the PCV hose from the top of the valve cover to the bottom of the resonator. Mine is showing signs of dry rot.

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post #7 of 21 (permalink) Old 10-27-2008, 08:59 AM
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Re: P0506 (Idle Control System RPM Lower Than Expected)

Thanks for the threads. This site is awesome. Cleaned the MAF sensor and throuttle body butterfly, gained appx 100 RPM at warm idle and check engine light has not reappeared. For now anyway.
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post #8 of 21 (permalink) Old 10-27-2008, 07:07 PM
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Re: P0506 (Idle Control System RPM Lower Than Expected)

I am having the same p0506 code with the check engine light. How would I go about cleaning the MAF sensor and the throttle body butterfly? At times I do notice a drop and bounce in rpms when idling.
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post #9 of 21 (permalink) Old 10-27-2008, 07:37 PM
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Re: P0506 (Idle Control System RPM Lower Than Expected)

Here's the how-to for the throttle body: http://www.coloradofans.com/forums/view ... =8&t=54407

For the MAF sensor, pick up a can of CRC MAF Sensor Cleaner at a local auto parts store



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post #10 of 21 (permalink) Old 10-29-2008, 09:08 PM
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Re: P0506 (Idle Control System RPM Lower Than Expected)

Thank You!!
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