ECM will not communicate with code reader
 

It seems a bit odd but the ECM will not communicate with a code reader to see if there are any other issues.

I had electrical problems where the car would not crank. The mechanic somehow figured out a way to get it to crank and it runs perfectly. should I worry that it doesn't communicate or should I take it a dealership to have them put it on the machine to see why it isn't working.

What year car and what code reader are you trying to use?

Edit: Saw your other post saying it's a 95. 95s were an oddball year being "OBD 1.5" as it'd be called. You have to have the right code reader to read it as a normal OBD-II reader will not read it nor will a OBD-1. You need an adapter. As for the fans; they don't kick on till (I think) 220 degrees or if the SES light is active.

ok. I will try that. Would I be able to purchase this adapter at a local part store?

As for as the fan. The car was driven for quite some time as well ran for a long time sitting and the fan still didn't turn on.

More than likely not. Most parts stores only sell them in "kit" that runs $$$. I can't remember what the adapter is so hopefully someone who remembers will chime in.

You could run the car all day, but if the temps never reach 220, they won't kick on. Keep an eye on the gauge. As long as it doesn't go in the red, you'll be fine. You can install a mechanical gauge too if you're that paranoid about the temps.

the 95 will not connect with a code reader. you need a obd1 scanner with the proper obd2 converter or do this.

I am not so much worried about the temperature. I just installed a new engine because it ran hot and cracked the heads. I want the fan to work and if it doesn't then I need to either replace it or find out what is causing it not to turn on. This fan problem could have been the issue with the previous engine.

Crabby... thanks I will check into that.

A Tech II will also read the codes with no special adaptor. Only problem is the Tech II is big $$$

As for the temp issue, test the fans by applying power directly to the motors, they should power up, if so look at the wiring and sensor. If they dont power up then look for your nearest O'reilly's or Advance Auto and replace them.

Massey

I am having all the exact same problems with my 2000 3.8l I am also having misfire issue. I am thinking it could be a PCM fault. Ideas?

All three fans only come on when a/c is on. Never seems to overheat. Stalls occasionally also no check engine light and no communication with PCM period. I am torn between maybe wiring harness issue or PCM?? I really was just wondering if you figured anything out.

New Tech II "clones" are $290 shipped. I have two and they work perfectly and the internal workmanship is exemplary.