What are the engine fault diagnosis procedures?
2 Answers
Engine fault diagnosis steps: Understand the time and symptoms of the fault occurrence; Use the automatic diagnosis mode of the engine management system for diagnosis; Conduct detailed inspection of the engine system and components to confirm the fault location and cause. Engine starting faults are roughly divided into the following two categories: 1. The engine cannot rotate normally. (1) Check the battery voltage. (2) Check whether the battery terminals, wire connections, etc. are loose. 2. The engine can rotate but is difficult to start. Check the starting system, including the ignition switch, start switch, neutral start switch, and starter condition, and whether the wiring connections are loose.
As someone who frequently repairs cars, I have a standard procedure for handling engine malfunctions. When the warning light comes on, I immediately stop the vehicle and carefully listen for any abnormal noises or check for smoke leakage in the engine compartment. Then, I connect an OBD scanner to the port to read the fault codes. For instance, a code like P0300 indicates an ignition issue, so I inspect the spark plugs or high-voltage wires for damage. Common causes include clogged fuel lines or aging sensors, and I systematically check the related components. After repairs, I clear the codes and take a test drive to confirm normal operation. Speed is crucial in this process because delays can lead to more significant damage, such as catalytic converter failure, which drastically increases repair costs. I’ll share an example: many people skip diagnostics and replace parts directly, wasting money. Through timely action, I help clients save costs while enhancing safety. Regular oil changes and sensor inspections can prevent over 50% of minor malfunctions.
