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Re: 1999 jeep cherokee
Sounds like a BUS problem. The BUS is a communication system that the vehicles computers use to communicate with one another. Without this, you may or may not run. The BUS is a pair of wires that are twisted (to prevent RF interference) and shielded, and run from one computer to the next. Without a good set of wiring diagrams, and a DRBIII, it is almost impossible to repair a problem such as this, unless you happen upon a damaged wire, or a blown fuse by accident.
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Hi, the no BUS is usually a seriuos issue with engine controller communication. Can you check and see what trouble code is stored in the PCM (engine comuter)? This code needs to be retrieved with a code reader available at most auto stores for around $40. If you can give me the code, I can tell you exactly what is wrong and what will be needed to repair your Jeep.
All the modules are connected together to communicate with each other via the PCI bus. It is possible that one of the modules is pulling the bus down.Since the vehicle won't start it could be any one of the modules. It will be a process of elimination to find the faulty one by disconnecting them one at a time. Here are a few, powertrain control module (the one you replaced) Instrument cluster, overhead console, anti-lock brakes, airbag. Since the cluster unplugged wont read anymore, just try to start the vehicle to see if that was the one. Otherwise see if the odometer message of "no bus" goes away after each one is unplugged.
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in the driver side kick panel down by your foot(behind it) there is BCM body control mogul there is 1 of 2 problems there can be a loose ground here or the mogul has gone bad here is a link to have it repaired,
I just had the same problem of my 2001 jeep cherokee not starting with no gauges responding and a "no bus" reading. After reading the responses I changed out the CPS and my jeep now runs great! however, it was not as hard as I thought it would be. Very easy with 7/16 bit and a 10inch extender. In and out in less than 5 minutes. Finding it was the hardest part. Blends in with the bell housing. I did this from under the jeep with a good shop light. I paid about $80 for the part here in Atlanta, GA
I used to have the NoBUS show up on the odometer also, but always while driving. The immediate fix was a sharp rap on the top of the cluster with my fist. To fix it permanently, I removed the cluster,cleaned the contacts both cluster and harness with spray contact cleaner, then applied some dielectric grease to prevent any further corrosion.