Originally Posted by SCACExOFxSPADES
Got an 04 Jeep Liberty 3.7L auto. I know I need to change the speed sensor. Problem is, where is it? I know people have said look on the rear diff, which i replaced the sensor and the harness, but that hasn't solved my issue. I've been told that that's just an ABS sensor and the Jeep get it's speed from the tranny. I was told to look on the transfer case, but I can only find the x-case position sensor. Anyone have a diagram specific to my Jeep or know where I can get one? The Haynes manual I have doesn't even list it...
The sensor is on top of the rear diff...it is polarity sensitive so make sure it is wired the correct way around. You may still have a bad connection or broken wire somewhere which you will have to trace. I had a bad connection which I fixed...took about 100 miles of driving before the circuitry was happy and the speedo started working and CEL went out.
The 2005 CRDs have a factory issue where the wrong lubricant was put in the diff...this chewed up the sensor so the dealers would have to replace the sensor and put the correct fluid in the diff....don't know if this applies to any other years/models.
You can download the relevant year KJ Service manual here.....includes circuit diagrams.....the 2003 year model will be close enough to your 2004 KJ.