my buddy just recently bought a 2000 ram2500 with a 5.2L 318 with around 160,000 miles for his band to go on tour with. its a van but i figure that it might be able to be generalized into the ram category. they are leaving in a few weeks and ive got to try and get this light off and past smog check as i live in california.

so here we go, it has a p0505 code so i instinctively replaced the IAC motor.

did not solve the issue haha

so a few questions,

1. where is the computer on these vans? i havent spent a whole lot of time on these

2. i pulled the plug on the iac motor and tested the voltage. all four have alternating voltage, cycling between 13 and 0... in my infinite stupidity, i forgot to test the wires when plugged into the IAC. (i live 30 miles away from the van)

and

3. i read that emissions codes can in no way be deleted unless it is with a reader, is this true?

also, there seems to be something wrong with the interior lighting. the **** for the lights has a click, the adjustment for dimness and another click. the click all the way to the right has nothing, but turning it to the left for the dimness turns on the gauge lights AND interior lights. are these switches prone to go bad or something? i hope you guys understand what i mean haha

i apologize for the long story here but i really need to get this thing going and i appreciate any and all advice

thanks so much guys

 

P0505 Idle Air Ctrl Motor Circs

If you are getting switching voltages on all four wires, that implies that the PCM is able to control the IAC. If you still have the code with a new one.... Did you clean out the 'well' the IAC goes in to when you changed it out? They are known for fouling up, and thus, the IAC, even though it is working 'properly', doesn't regulate air flow properly, and confuses the PCM. Also possible you just got a bad new one....

Disconnecting the battery will clear all codes. (except ABS codes??)

Pull the dash, and have a look at the wiring for the headlight switch, don't know if the vans are the same as the trucks, but, headlight switch seems to be a problem prone area for us...

 

OI'm having the same issue . I'm running a high idle about 1200 and a new iac didn't fix the code. Also has a hard start will star then stall slowly once in a while never dies once its running. Iac doesn't look like its moving. The voltage is the same on mine as the van. I'll clean the throttle body and see if that works. Also when I replaced the iac it didn't have a code just the symptoms. The code only appeared after I replaced the iac possible and new iac? Sorry for stealing thread didn't see any sense for two threads on same topic. That are new.

 

Should disconnect the batter when changing parts of this nature as well, so the PCM can relearn the base values. (a process it goes thru after the battery has been disconnected.)

 

one thing i noticed is when resetting the codes by disconnecting the battery:

i switched the key to the on position after hooking it back up and after about two seconds, the check engine light turned on and stayed on completely.

im going to check voltages while its plugged in and see what i get.

but just so i get it, all four wires need to be fluctuating? it shows the pcm can control the IACV?

 

yeah, there are two circuits there, PCM moves pintle by altering currents to a DC motor. Reversing the polarities on a DC motor will spin it the other direction.

CEL will test, then stay on till ya start the motor. If it still stays on after the engine is running, and the same code comes up...... given that the wires appear to be doing the correct tricks.... I would take the IAC back, and try another one.

 

sir, you are awesome!

i still have the old IACV as well.

another question... what is pintle?

i also read that if you start the motor with IACV unplugged, it should come up with other codes. but the weird thing is mine only comes up with one. that p0505.

any insight on that?

also, im going to be cleaning that seat for the iacv. i changed that out in the parking lot of work like ten minutes before i had to be in for work haha so i was a little rushed.

and when i pull the dash to have a look at that headlight switch, what is it im looking for?

 

also, it idles fantastic.. which i dont understand why it couldnt be anything but the computer... i might be going out to work on it tonight, so any help would be fantastic! im going to be pulling the IACV again

 

pintle is the little pointy feller that the IACV moves in and out to regulate air flow.

does it idle at the right speed cold/warm??

 

And do NOT turn, pull or push the pintle. The IAC is a stepping motor. The Pcm send voltage to it to drive it closes, then pulses to open and counts the pulses. Resulting rpm is read by PCM and compared to data programmed to see if it matches. If there is crud in the port, it thinks it is closed when i may not be preoperly seated.