The_Soviet

I need help!!! I have a '90 XJ Laredo which is a tad under the weather lately. I was having issues with the CPS and have replaced it... many times. So after the 3rd sensor I have replaced in the last 4 months, I am calling on the jeep community to help me find out WHY my CPS keeps giving up the ghost. It seems to be a common problem and i would like to solve this mystery before I lose faith. I love my Jeep, but I can't afford to keep feeding it new sensors. At this point, I am faced with either fixing the real problem or selling the car. Any feedback will be greatly appreciated. Thanks!

huntingman2706217

so every time you have replaced it... its ran fine after that? they dont go out this often... something is zapping it or grounding it out... need to shoot some wires...

The_Soviet

Sure, it runs fine... for a while. So, I understand I have an electrical problem, the bigger problem is I don't know much about electrical systems. What do you recommend I check/do? Today when it died again, I replaced the sensor and it started up. Then, about 200 yards later, it died. Something must be seriously wrong. Thanks for the input.

huntingman2706217

To test the CPS, near the rear of intake manifold, disconnect the sensor harness connector from the main wiring harness. Place an ohmmeter across terminals B and C.
Ohmmeter should be set to 1K-to-10K scale for this test. The meter reading should be open (no resistance). Replace the sensor if a low resistance is indicated.


this will save you the guess work on if just you moving the wires while replacing is making the difference or if its actually burning them up...

huntingman2706217

i cant seem to find a wire diagram... need to find one and see where the wires are coming from... i would guess the distributor or the computer...

The_Soviet

I'll give it a try. Thanks! I'll let you know what I find.

huntingman2706217

i know you probly dont want to wait but i have access to alldata... just dont have the time to mess with it till like next week probly... going away for the weekend and about to go to bed... i know they would have it...