Discussion
Which fault does a corroded connector on the bus produce?
Answer: B
A high resistance joint distorts the differential signal and the faults come and go. The last option describes exactly how that presents, which makes it a correct and more useful statement for diagnosis. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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