Ok, so my fans stopped working right before i replaced my radiator. I installed my new rad. and the fans still don't work. I thought it was somthineg simple like a fuse or a relay. I check all fuses and relays tonight, i direct wired my fans and they work. The fuses and relays are good. The problem i am having is that where the relays plug into the PCM #1 (according to Haynes Manual) is ALWAYS supposed to have juice going to it. It does not. And # 5 is not supposed to have juice going to it until the key is "on" , it does though. I thought i could fix this problem by "resetting" my PCM (like on Shoebox's page) by unplugging it for 15 secs and then plugging it back in. This did not seem to change anything. My mech says "i am not so sure dude" (as we work without all the computer testing **** some places have).

WHAT could be the problem? could it be my PCM or is it a fuserealy somewhere? I checked all the temp sensors and they seem to be plugged in and OK i guess.

 

Try and make the PCM throw a code and see if the Fans start spinning. AFAIK, having the SES light on will cause the fans to turn on.

 

Both sockets should be Hot all the time. Pin D1, D5, F4 and F2 should be +12Volts when ever the key is on. Pins D1 and F4 are powered by the fusible link. Pins D5 and F2 are fed by the #6 fan fuse. Try grounding D2 to see if the primary fan kicks on and then ground pin F5 and see if the secondary fan kicks on. Also check the engine coolant temperature sensor.

See if the primary fan comes on when the AC is turned on.

 

Fan does not come on when the AC is on. I replaced the Coolant sensor today (right over the harmonic balancer) and i have not tested it out yet (i was late for work) i am planning on doing it tomorrow. My thought now is that the fusible link is out or that the coolant sensor would fix it. I am still leaning toward the link cause the fans don't kick on when the AC is on. What do you guys think? Would the fusible link be able to do this? Thanks, Nick

 

One way to find out as I mentioned above is to pull the relays and measure the voltage at pins D1 and F4 of the 2 relays. If that is ok, put the relays back in and try grounding pin D2 and F5 with a wire jumper to ground. D2 and F5 are the control signals from the PCM to turn the relays on. If they come on when you jump them, either you have a wiring problem or the PCM signal is not getting to the pins for several reasons.

 

Thanks, i did the above mentioned and the fans do come on with grounding. The small fan now works, however the big one (important one) does not...any idea's?

 

Not sure what you mean by BIG one but in any case, you'll have to ohm the wires for each pin of the relay socket. Do you have a wiring diagram or do you need us to help?

 

i am ok i have them. TY the BIG fan is the pass. fan. the bigger of the 2 fans. (main cooling fan)