Question about 1999 Jeep Cherokee
This year for our 1999 Jeep Cherokee Sport has been just one thing after another... and it may be the same unresolved issue. A year ago, it was having issues starting so we replaced the starter. 6 months after that the crank sensor had to be replace due to a combo of not always starting and then the dreaded "no bus" error. 3 months later, we begin having issues again, and the mechanic said it was the starter, AGAIN. So, we replaced that and start having issues again the very next day- we called the mechanic and they said they felt it was going to be the starter AGAIN! After one day!!! We took the original starter they made us replace just a few days before to autozone and it turns out the starter was absolutely fine- it works and they made us pay $400 to replace it!!! THEN, two days later the check engine light came on and the code says its a trasmission range sensor 1999 issue. I am losing my mind... any clues?
Thunder is the man. He is 100% on. Now if we could only get the dealers to listen to him, every vehicle owner would have a driveable vehicle, at least til the next issue surfaces. I will add that doing voltage drops before you spread your Jeep all over the driveway cleaning what he said, may point you to where to go look at first.
Posted on Oct 01, 2009
No bus issue is caused by a lack of connection between the computer and sensors or dash gauges. It can also be triggered by a low power condition related to electrical connections at the power supply side of the computer. (or poor grounding at dash, firewall or fenders.) The starter issue likely is related but only in that power may be getting lost between the battery and the starter as it passes through the power distribution center. That could cause the starter relay to not operate intermittently.
Sometimes it is also related to the crank sensor but since that was replaced I'd be more concerned with the connector integrity there.
This sounds like a lot to check because it is.
Corrosion on low voltage connectors is not as easily identified as is the crud that grows on your battery terminals. Minor oxidation can appear as just a blackening of the pins or pin receivers. You should use electrical contact cleaner, not sandpaper or other abrasives in cleaning as most are plated with a non-corrosive and sandpaper etc may clean but render them more prone to further corrosion.
If you need to, remove the power distribution center and clean it from the back-side. You may also need to remove the dash gauges and clean the connectors there. I'd begin by cleaning all connectors in the engine bay including the computer, both male and female ends on all, and running a permanent ground from the battery through the firewall to the dash brace at it's bottom edge and making sure the computer grounds are clean and secure. after that, go to the more difficult items and do the same testing, removal and cleaning there as well.
Hopefully, you will not need to go through everything I've noted before you find the problem, and hopefully when you are finished the problem will be resolved. Unfortunately, there are so many different causes, I can't give you one specific item to just replace...that's why shops get driven crazy when a problem like this appears. And for most, working on stuff like this does not make a profit...If all billable hours were charged, it would cost several thousand dollars for time spent alone!!!
Posted on Sep 30, 2009
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Posted on Jan 02, 2017
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