I recently went to start my 2000 Jeep Cherokee (4.0L six cylinder) and could not get it to start up. It would crank, but just would not turn over. After letting it sit for a few seconds, on the odometer appeared "no bus". I had never seen this error before and of course, the engine light stayed on. After doing some research online, it seems that many Jeep owners pointed out that the culprit was the crankshaft position sensor. Well, because there were so many helpful suggestions online about what the problem was, I wanted to post basically how to replace this annoying bugger. First, to give you an idea of what kind of a mechanic I am (1 being I have never picked up a tool and 10 I can drop in a Cadillac Northstar engine), I would say I am about a 4. I can do the basics, so if you feel confident you can use a rachet and you don't mind getting a bit greasy, you can perform this
repair. You'll probably want to get your rachet setup. You'll need a standard rachet, an extention (approx. 10 to 12 inches), hinging/pivot
socket, another extention (approx. 3 inches) and an 11 mm socket. Now that you kinda have an
idea as to where the sensor is located, you can move to the ground. The sensor connector will be found just beyond the light grey connector. The CPS will be black in color. Be sure your keys are out of the ignition. Disconnect the CPS. Here comes the REALLY fun part. Wiggle your rachet into place. If you are right handed, you'll want to use your left hand to locate the two bolts of the CPS (basically at the top of the transmission where it meets the engine) and your right to hold the rachet, getting it ready to loosen the bolts.
Foget trying to use your eyes, as it will be easier if you pretend you are blind and focus mentally on your hands and arms. While holding the socket securely on the 11 mm bolt with your left hand, use your right hand to release the bolts...one at a time (may require a little of WD-40). If you have a rachet that automatically cranks, more power and less patience to you. After you have taken out both bolts, you can now pull the crankshaft position sensor out in an upward direction. Looking back
down into the engine bay, you should see something like this: And here is your faulty part: This part can be found at most local autopart stores for approx. $100 or less. I would try to keep it under that amount. I paid about $85. You may be able to
find it online a bit cheaper, but I don't know the part number for this sensor. It would be a better route if you can afford to wait a few days. Brian What are the symptoms of a failing crankshaft position sensor?Symptoms of a Bad or Failing Crankshaft Position Sensor. Issues Starting the Vehicle.. Intermittent Stalling.. Check Engine Light Comes On.. Uneven Acceleration.. Engine Misfires or Vibrates.. Rough Idle and/or Vibrating Engine.. Reduced Gas Mileage.. |