Heavy Duty Equipment Technician Red Seal Exam Prep · Question
On a large mining excavator, the onboard diagnostic system reports 'CAN Bus Error - High Resistance on Data Link.' What is the most probable cause for this error message?
High resistance on a CAN bus data link typically results from physical wiring issues such as corrosion at connectors, loose terminals, or damage to the twisted
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Question: On a large mining excavator, the onboard diagnostic system reports 'CAN Bus Error - High Resistance on Data Link.' What is the most probable cause for this error message?
Answer options: ✅ Corrosion or loose connections in the CAN bus wiring.
- A fully discharged main battery pack.
- Excessive engine speed sensor output.
- A failed hydraulic pump, increasing system pressure.
Correct answer: Corrosion or loose connections in the CAN bus wiring.
Explanation: High resistance on a CAN bus data link typically results from physical wiring issues such as corrosion at connectors, loose terminals, or damage to the twisted pair wiring itself, disrupting signal integrity which is critical for CAN communication.
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