St Louis SHO
Rollin' coal
So I'll explain the issue I ran into, then the problem I found.
95 ATX Will not idle.
Obviously, I threw an IAC at it first with no avail. So I decided instead of throwing parts at it, I would truly diagnose the issue. I started by hooking up my Snap-On Solus scan tool. It told me that the IAC was commanded on, but truly it was not. So I eliminated wiring issues, then moved on to backprobe the PCM for IAC operation. There was no waveform from the PCM to the IAC. (square type waveform) Wala, I found it. Replaced the PCM and all functions are correct again.
95 ATX Will not idle.
Obviously, I threw an IAC at it first with no avail. So I decided instead of throwing parts at it, I would truly diagnose the issue. I started by hooking up my Snap-On Solus scan tool. It told me that the IAC was commanded on, but truly it was not. So I eliminated wiring issues, then moved on to backprobe the PCM for IAC operation. There was no waveform from the PCM to the IAC. (square type waveform) Wala, I found it. Replaced the PCM and all functions are correct again.
