I just got a 1999 GC Laredo 4.0 that had a fan relay issue and the previous owner cut the oem plugs off and hard wired a switch to the electric fan to keep it cool. Now I have replaced the fan relay and had the AC serviced, cleared the codes and eliminated the switch. The fan comes on with the AC as it should and also comes on at temp. But the wiring is now hard wired between the fan and the relay.

The problem that I am having is that every morning when I start it up I get the CEL again. I get the code reader out and it shows its the fan relay so I clear it. Everything is then fine it cycles as it should. It will be fine for the rest of the day even hours later after sitting.

Question what color wires should be connected from the fan to relay? Right now its green to blue and then black/pink to black.

Any thoughts on what to check next?

It seems that the PCM is getting a bad signal at initial start up?
thanks

 

Anyone see this before or ideas as what to check.

 

Several months ago I had to troubleshoot a bad solid state fan relay, but I doubt the wiring colors are the same between 99 to 02.
I used the Factory Service Manual for the 02 GC to check wiring connector pinout and colors between the SS relay and electric fan and the ECM.

If you are interested I can look up the colors in the 02 FSM.

 

should be able to find here,..http://www.jeep4x4center.com/knowledge-base/index.htm

 

If they had the fan wires connected backwards could this casue the initial CEL but still allow the fan to work as it should? Would it even work if it was wired wrong? Also if the fan motor is going bad could it trip a CEL even though it spins freely?