Sounds like the the Cat manuals are woefully short on info. Many times just a continuity check on a wiring harness and across the connectors will find many troubles. Crusty,rusty loose chassis return connections are regulars. On cards, modules etc, a check of the cards power supply/filter then checking for traffic data on the buss will often find the trouble. Corrupted data from electrical noise is common. A $1500 card will also show a false fault due to a $49.99 sensor failure/mis-adjustment. The function of a sensor,card, wiring harness and computer can be checked. Just by either injecting a test voltage,current or frequency and look for the appearance or absence of the data on the system. The good old dunking a sensor in hot water, applying pressure or waving it past metal will verify most faults. A half decent ohmmeter and a $100 surplus oscilloscope will find most of the faults. Most of the time the faults trace back to rodents, big clumsy feet, panels doors left off/not properly installed let moisture,heat,dirt or oil enter.And damaged incurred during assembly, maintenance or service.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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