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Which technique identifies the module preventing sleep?

  • A.Reading fault codes, which name the module that has failed to enter its sleep state at the appropriate time
  • B.A visual inspection
  • C.Watching the network traffic with an analyser to see which module continues transmitting after the sleep delay
  • D.Monitoring bus activity while removing fuses in turn

Answer: D

An analyser shows which node keeps sending messages after the others have stopped. The last option describes exactly that technique, which makes it a correct and more specific version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming what changes and what stays the same is the reliable route through questions of this shape.

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