Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A CAN bus system experiences intermittent communication errors. Which of the following conditions is most likely to cause such a problem?
CAN bus communication relies on signal integrity and proper termination. An open circuit in a data line, a short to ground, or incorrect termination resistance
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Question: A CAN bus system experiences intermittent communication errors. Which of the following conditions is most likely to cause such a problem?
Answer options:
- Incorrect battery voltage. ✅ An open circuit in one of the data lines or incorrect termination resistance.
- A completely failed engine coolant temperature sensor.
- Excessive tire pressure.
Correct answer: An open circuit in one of the data lines or incorrect termination resistance.
Explanation: CAN bus communication relies on signal integrity and proper termination. An open circuit in a data line, a short to ground, or incorrect termination resistance (should be 120 ohms at each end) can severely disrupt communication and cause intermittent errors.
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