Car diagnostics by an electrician
Diagnostic stages:
1. Taking anamnesis:
— Question the driver about symptoms of the malfunction, past repairs and maintenance.
— Study the car’s service history.
2. Visual inspection:
— Check the battery and its terminals.
— Inspect wires, harnesses and connectors for damage, corrosion or poor connections.
— Check fuses and relays.
3. Using the diagnostic scanner:
— Connect the scanner to the vehicle’s on-board diagnostic connector (OBD-II).
— Read and decipher diagnostic trouble codes (DTCs).
— Check real-time data such as engine speed, coolant temperature, battery voltage.
4. Checking the charging system:
— Measure the voltage at the battery terminals with the engine running.
— Check the voltage on the generator.
— Check the operation of the voltage regulator.
5. Checking the starting system:
— Check the battery for voltage.
— Check the starter and starter relay.
— Check the condition of the spark plugs or glow plugs.
6. Lighting check:
— Check the operation of all headlights, lanterns and direction indicators.
— Check the condition of the lamps and wiring.
7. Checking other electrical systems:
— Check the operation of windows, mirrors, audio systems and other electrical appliances.
— Check the serviceability of sensors and actuators.
Tools used for diagnosis:
— Diagnostic scanner
— Multimeter
— Lamp tester
— Load forks
— Engine stethoscope
— Scanner for airbags (if necessary)
General tips:
— Start diagnostics with the most common faults.
— Use reliable tools and equipment.
— Refer to the manufacturer’s technical documentation for specific information about this vehicle.
— Do not hesitate to seek help from other specialists if necessary.