Just had an IAC on a wrangler (TJ) (short on to fuel rail inside conduit, rail had pushed through split).
4 wire. Each pair was always switching so two high and two low. As a thought looking at yours I would thinking Brown/Green channels OK. Blue/Red open circuit somewhere after the IAC.
But as Robski pointed out Amp clamp will tell you.
Here is a known good capture of a Chrysler 4-wire stepper type IAC valve. I have included the jpg picture from my eBook and the original psd files.
I believe you have an open in one of the drivers in the PCM (could be an open in one of the wires too). If my suspicions are correct, when you unplug this IAC you will only see activity on 3 channels. The fourth will be dead.
This may also explain the weird pattern on the beginning part of the one channel. (failing driver)
Also as Robski suggested, a current measurement would tell you the same thing. I believe you will have flow on only two wires.
After looking at your file closer. I believe you will find the issue on the red and blue channels (one of those two has a completely open driver or an open control wire). Also the tan channel looks like crap, but it is actually still functional.
Fat Freddy wrote:Just had an IAC on a wrangler (TJ) (short on to fuel rail inside conduit, rail had pushed through split).
4 wire. Each pair was always switching so two high and two low. As a thought looking at yours I would thinking Brown/Green channels OK. Blue/Red open circuit somewhere after the IAC.
But as Robski pointed out Amp clamp will tell you.
What is the definition of that P1505?
HTH
FF
Oh crap, sorry I didn't read your post before posting my response. I agree with you completely.
Oh crap, sorry I didn't read your post before posting my response. I agree with you completely.
Voltage spikes indicate current flow
Would this only apply where an inductive circuit is operating correctly?
In other words the lack of a spike could indicate poor current flow or a shorted winding? Is that correct?