When Diagnosing a Data Bus with a Communication Failure on All

question 17

Multiple Choice

When diagnosing a data bus with a communication failure on all modules, voltage fluctuations exceeding 5 volts DC indicate what condition?

• A) Partially open grounds.
• B) Stray voltage spikes generated by acidic engine coolant .
• C) Electromagnetic or radio frequency interference.
• D) Defective V-ref circuit.