Correct, ive never got a confirmation upluging the sensor does activate the fan on other vechicles it does.

 

ok so for what its worth on my 98 i had aux fan problems for a long time it turned out to be that when i plugged the relay into the pdc the spade connectors that it was supposed to be plugging into were loose and were being forced away from the terminals as the relay was pushed into place in the pdc. It felt tight as i believe that yellow plastic on the surface of the pdc provides some resistance that lead me to believe it was making good contact.
It would work intermittantly than it would start overheating with the a/c on at idle, After replacing the fan motor a couple of times in several years i finally got pissed and started getting more in depth. Anyways i imagine this scenario is possible with any of the other relays located in the pdc. I had to take the pdc loose and flip it upside down to find and fix my problem... good luck
I ended up replacing a couple of the spade connectors as they just didnt fit snug enough for my satisfaction

 

The relay has been replaced. Coil replace after problem started. Still the issue is the auto shutdown relay click on then off again. Any suggestions for what I should test next? Thanks.

 

FYI, For those who were wondering where I got the info on testing the auxiliary fan.
http://www.lunghd.com/Tech_Articles/..._Diagnosis.htm
But that is not the problem now.
Thanks

 

Take it to a shop, throwing parts at it ain't doing you any good. You may have smoke the PCM when you poked around with a 12 volt test light probing sensor plugs.

 

That's Renix system testing. Impossible to short thing with a test light it just checks for current ...

 

No wires contacting underneath ?

 

Thanks for you patience on this. If you mean on the power center where the relays and fuses are, no wires touching or shorting out. Connections are clean. All relay and fuses in good condition.
Again, any ideas on why the auto shutdown relay may click on and then off again. I can hear the fuel pump start for a few seconds. Any other test before replacing pcm/ecu.

 

Uderneath by ds some times o2 wiring falls on ds and rubs causing no start issue .

 

I looked there yesterday and did not see any problems, but I will double check later. Thanks.

 

Some time figuring out what its no leads you to the issue.

 

Thanks to all who helped. Replace the ECM and running again.