Ok my pcm on a cold start or any start for that matter the blue 42 pin is grounded at all times? And my red pin 33 does absolutely nothing a/c on or off does nothing??? What is going on?

 

I'd say one of two things, something in the tune, or the temp input to the PCM...maybe the PCM is getting feedback that the engine is up to fan turn on temp? ie: bad engine coolant temp sensor or shorted wiring from the sensor to the PCM?

 

I was thinking the same thing, but the temp gauge works correctly... I dont know if it goes through the pcm first or not. And whats the chances of the temp and red pin 33/ac pressures both acting up... unless this is some crazy coincidence... I guess anythings possible. Wheatley is getting me taken care of so I hope it all pans out for me. Thanks Charlie, you da man!

Any other opinions please post similiar experiences...

 

I was also wondering if the PCM and gauge use the same sender, not 100% sure on that. Do you have access to a scan tool where you could monitor the PCM's interpretation of engine coolant temp?

 

No, I need one...

 

He was just up here the other day,temp sensor was perfectly fine.
I have looked at the file several times thinking I possibly looked over something,everything should be working fine.
I am going to send an 02 0411 PCM,if this doesnt work then there is something else going on somewhere.

 

You thinking that maybe something's shorted in the PCM Charlie? This is a weird problem

 

I'm not sure,this is not something I run into often at all.Usually everything is straight forward,simple and work great.

 

Nothing like a challenge to keep you on your toes