- Location
- annapolis, md
nothing about this sounds easy, unless you are experienced w/ auto electrical / computer systems. just my take on it.
Just followed this mod to the letter, and I got a CEL. 2001. Using the BL/WT wire from C3. The fan works but I got a cel once warm. Can anyone confirm that switching to the BL/WT wire from C1 will fix it?I just finished doing this on my 01 XJ at first it only half worked and I got a cel ,first I found the db/pk in the large loom and confirmed it was pin 2 on con 3 at the PCM , I cut it and ran both wires to the relay as per instructions , I then looked for the db/w wire my large loom only had 1 , I spliced into it , connected the ground & hooked up a switch and checked all connections. My fan came on when I activated the switch no cel , it came on at the right temp but when I tried it with the AC it would not come on and I got the cel. I looked back thru the instructions and saw the pic of the small loom and db/w wire.This is the loom that connects to con 1 on my 01 , I swapped connections to this wire and now everything works correctly and no cel. Thanks to the OP for this mod.
Just followed this mod to the letter, and I got a CEL. 2001. Using the BL/WT wire from C3. The fan works but I got a cel once warm. Can anyone confirm that switching to the BL/WT wire from C1 will fix it?
Check this and see if it is different. I may not have updated it on this site.
http://www.xjtalk.com/showthread.php?5060-1997-Electric-Fan-Override-Switch
I followed these instructions and it worked very well on my 99 XJ, but for some reason ever since installing this relay, I am blowing O2 heater fuses. I have triple checked everything with a multimeter, drawn schematics of how everything plays out, but for some reason I cannot figure out what could possibly be causing this to happen. Has this happened to anyone else?
I am certain this is the cause, as when I remove the relay I added, I stop blowing 02 heater fuses, but when I put the new relay back, they blow again.
How long did you let it run for? The fan doesn't just automatically turn on with the A/C, rather it cycles on and off occasionally while you're using it.
That's pretty normal. If you wanted to truly test it, you could unplug the CTS, if the fan comes on immediately, the ECU's relay control output is working correctly and it just didn't want the fan on for some reason. This will result in you getting a DTC for a circuit fault on the CTS that you can either clear or let disappear on its own, so don't do it if you have an emissions test coming up.
I let it get to operating temperature (200ish) idling in the driveway. No electric fan at all, expect when I flipped the new switch.
I took it for a 20 min drive with the A/C on, up some hills and put some heat into it. I got it to 210, but again, no fan without the switch. I’m thinking it’s normal, but just wanted to see if anyone else had a similar problem.
Thanks for the great write up.
Wondering if anyone has done the other option you listed having normal operation, full on, and full off for water crossings, and how it worked out for them. I have read thru most of the replies to your write up and didn't seem to find anything saying that they had done the 2nd option and that it worked, or they had issues, etc.