Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A diagnostic trouble code (DTC) indicates a sensor circuit rationality error, meaning the sensor output is inconsistent with other related sensor readings. Which troubleshooting approach is most appropriate?
A rationality error suggests a circuit issue or an incorrect reading. Verifying electrical integrity and comparing outputs with related sensors helps confirm if
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Question: A diagnostic trouble code (DTC) indicates a sensor circuit rationality error, meaning the sensor output is inconsistent with other related sensor readings. Which troubleshooting approach is most appropriate?
Answer options: ✅ Verify the electrical integrity of the sensor circuit, including wiring and connectors, and then cross-reference with other relevant sensor data.
- Replace the sensor immediately without further testing.
- Clear the DTC and assume it was a transient error.
- Adjust the engine's fuel pressure regulator.
Correct answer: Verify the electrical integrity of the sensor circuit, including wiring and connectors, and then cross-reference with other relevant sensor data.
Explanation: A rationality error suggests a circuit issue or an incorrect reading. Verifying electrical integrity and comparing outputs with related sensors helps confirm if the sensor itself, its wiring, or a related component is faulty, rather than just replacing parts prematurely.
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