What is the Basic Process of Automotive Fault Diagnosis?
2 Answers
Automotive fault diagnosis basic process is the most fundamental diagnostic procedure in automotive fault diagnosis, representing the most general overview and summary of diagnostic content. The basic process of automotive fault diagnosis includes starting from fault symptoms, 1. Through inquiry and test drive: Verify fault symptoms. 2. Analysis and research: Analyze structural principles. 3. Reasoning and hypothesis: Deduce possible causes. 4. Process design: Propose diagnostic steps. 5. Testing and confirmation: Test and confirm fault points. 6. Repair verification: Verify after fault elimination. 7. Finally achieve the purpose of identifying the ultimate cause of the fault.
When the car has issues, I usually start with a thorough inspection: park the vehicle, let the engine cool down, check if any dashboard warning lights are on, listen for unusual sounds, or detect odd smells—such as a loose belt noise or signs of oil leakage. Then, I ask the owner about specific symptoms, like whether the car won’t move or if there are strange noises, which helps narrow down the problem. Next, I manually inspect basic points: engine oil, coolant, tire pressure, and the brake system to ensure everything is normal. If no obvious issues are found, I connect an OBD scanner to read the trouble codes—it quickly pinpoints potential problems, like a faulty engine sensor. The next step involves testing suspected components, such as using a multimeter to check circuit resistance or inspecting ignition coils. Once the cause is confirmed, I proceed with repairs and conduct a test drive to verify everything works properly. Throughout the process, I take it slow, prioritize safety, and keep logs for future prevention. Remember, regular maintenance reduces these troubles, and every diagnosis should follow a systematic step-by-step approach.
