Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy equipment technician is performing a differential pressure test on a Diesel Particulate Filter (DPF). The readings are significantly higher than the manufacturer's specifications. What does a high DPF differential pressure indicate?
High differential pressure across a DPF indicates that the exhaust flow is being significantly restricted. This is typically due to an excessive accumulation of
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Question: A heavy equipment technician is performing a differential pressure test on a Diesel Particulate Filter (DPF). The readings are significantly higher than the manufacturer's specifications. What does a high DPF differential pressure indicate?
Answer options:
- The DPF is operating efficiently, trapping minimal soot. ✅ The DPF is restricting exhaust flow due to excessive soot accumulation.
- The engine's exhaust gas recirculation (EGR) valve is stuck open.
- The Diesel Exhaust Fluid (DEF) quality is poor.
Correct answer: The DPF is restricting exhaust flow due to excessive soot accumulation.
Explanation: High differential pressure across a DPF indicates that the exhaust flow is being significantly restricted. This is typically due to an excessive accumulation of soot or ash within the filter's channels, which needs to be addressed through regeneration or cleaning.
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