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Systematic fault diagnosis

PRO · 35 minutes · Diagnose from symptom to root cause.

Visual learning map for Systematic fault diagnosis: observe, try, then explain. Diagnose from symptom to root cause.
Visual learning map for Systematic fault diagnosis: observe, try, then explain. Diagnose from symptom to root cause.

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Our learning goal

Diagnose from symptom to root cause.

Your turn: Choose one thing you would like to understand by the end.

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My lesson notes & project
Full teaching script
  1. Today: Systematic fault diagnosis. Our goal: Diagnose from symptom to root cause.
  2. Take one idea at a time. Pause after each sentence; ask for repetition whenever you need it.
  3. Never replace parts hoping. Work the six steps: verify the complaint, gather symptoms and freeze-frame data, list systems that could produce them, test the cheapest decisive check first, isolate by halving the circuit or system, then repair and re-verify under the original conditions. A P0171 lean code is not a sensor fault — it is the ECU reporting that it added fuel; the cause is usually unmetered air, a weak pump or a dirty MAF. Read live data, not just codes.
  4. Together: choose one example from the explanation and show how it works. What do you notice?
  5. Your turn: Take one live fault, write the six steps out, and name the decisive test at each branch.
  6. Reflect: what made sense, and what would you like explained differently?
Teacher lessons & videos

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