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1st Generation (1995.52004) 1st generation Tacoma information and discussion.

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Old 12-13-2006, 11:27 PM   #1 (permalink)
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p0505 code should i be worried

I am at a lost with my taco '02 I'm getting a P0505 Idle control malfunction code. RPM were at 1250 prior to the throttle clean up. I cleaned the throttle without removing it and the RPM jumped to 1750. What went wrong? Did I contaminate some ports? Do I need to remove the throttle and do a thorough cleaning? Is the throttle sensor gone bad or dirty? I checked hoses everything is intact. Your help will greatly help me.
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Old 12-14-2006, 01:58 AM   #2 (permalink)
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It is an IAC problem. You either have a vac leak, or something is wrong with the IAC.
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Old 12-14-2006, 02:09 AM   #3 (permalink)
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You might have knocked one or more of the vacuum hoses loose. That's what happened to me when I cleaned the TB a few months back. Check and double check all the hose connections, especially the ones right under the TB.
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Old 12-19-2006, 09:01 PM   #4 (permalink)
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Guys thanks!!! I found the solution "to my perdicament" this is what you need:
Multimeter
Battery (12 volt) and leads (wires)
RTV
Carb Cleaner
and most important ...carefulness
Disconnect the connector from the Idle Air Control valve
Test the valve by reading the resistance (ohms) when cold 18-23ohms when hot don't know (there is a number).
If you get proper ohms reading proceed to connect wires (any speaker wire) to the battery (hot to center pin negative to top or bottom pin. Listen to the valve click.
If you don't hear it remove throttle body then remove IAC valve (from the throttle).
Disassemble everything on the valve with screws -be very careful!!!!!!!!! Remember how everything is position on that valve.
Open BANG!!!! look at all that carbon crap clean.
Clean it with carb cleaner use toothbrush, Q-tips loosen all that crap.
Spin the magnet, Does it Spin? If it doesn't carefully use a rag and channel locks to soften the grip ang CAREFULLY spin the round magnet to loosen up. Continue to clean the center spindle ang blades and ports.
Lastly put everything together the way it was....drive 20 miles and the problem is fixed.
Hope this works...Sorry if you didn't understand please ask me any question and I will answer in more detail
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Old 07-19-2008, 04:57 PM   #5 (permalink)
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I have a 98 taco with a 99 or newer 2.7 it keeps throwing the cel and code p0505, ive already cleaned the throttle body and replaced the IAC valve, but it keeps throwing the same code, it ildes at about 750 rpm after start up which is normal. Im out of ideas!
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Old 07-20-2008, 09:52 AM   #6 (permalink)
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I have an '01 with the same issue...idle all over the place. For me it is the IAC valve. I have the 3.4ltr. Did some research online for cost to purchase a replacement. for a 6cyl it' just under $200. For the 4cyl it was around $750. Why?, I don't know.

Having my mechanic do it for around $275 (part and labor). It goes in shop on Thursday.

When it comes to Engine codes I leave it up mechanic this way I don't buy extra sensors and/or worry about what is wrong as jhkutterer. I have done it too many times in the past and purchased to many unneed parts.
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Old 07-20-2008, 04:09 PM   #7 (permalink)
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i guess im gona have to bite the bullet and take it to toyota, but I know its probably something that is only gonna take 5 min to fix and they will probably charge me a ton. they wanted $260 in just labor to change my MAF sensor. my mecanic told me that i might need to get the computer re-mapped or updated.

Last edited by jhkutterer; 07-20-2008 at 04:11 PM.
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Old 07-21-2008, 01:05 PM   #8 (permalink)
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Are you sure you're talking about the MAF not the IAC valve? It takes about 15-20 min to change the MAF. Two phillipe screws and unplug a wire harness. Don't know about the re-map or update, never heard of that.
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Old 07-21-2008, 11:02 PM   #9 (permalink)
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I already changed the maf, and IAC but its still throwing the iac code p0505, but it runs fine now.
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Old 07-22-2008, 10:09 AM   #10 (permalink)
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you can borrow a scan tool from autozone or similar type store. just plug it in and clear the code.
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Old 07-23-2008, 07:28 PM   #11 (permalink)
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already clearer it several times and it keeps coming back, im gonna do a plugs and wires this weekend, but I am completely lost as why it keeps coming back
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