Car electrical diagnostics
Diagnostic stages
1. Collection of information:
— Questioning the car owner about problems, observed symptoms and service history.
— Visual inspection of electrical wiring, connections and components.
2. Using the diagnostic scanner:
— Reading fault codes from the electronic control unit (ECU).
— View real-time data such as battery voltage, engine speed, coolant temperature.
— Testing of actuators such as relays, valves and sensors.
3. Manual diagnostics using a multimeter:
— Measurement of voltage, current and resistance in electrical circuits.
— Checking the integrity of wires, connections and components.
4. Analysis of results:
— Interpretation of fault codes and diagnostic scanner data.
— Identification of possible faults based on multimeter readings.
— Formulating hypotheses and developing an action plan.
Diagnostic tools and equipment
— Diagnostic scanner
— Multimeter
— Electrical wiring tester
— Special tools for certain makes and models of cars
Common car electrical problems
— Problems with the battery and starter
— Malfunctions in lighting and alarm systems
— Problems with electronic control modules
— Faulty wiring and connections
— Interference in the radio signal
Tips for diagnosing car electrical systems
— Always start with the simplest and most likely cause of the problem.
— Use proper personal protective equipment when working with electrical equipment.
— Refer to wiring diagrams and repair manuals for accurate information.
— If necessary, do not hesitate to seek assistance from a qualified mechanic.
— Check your vehicle’s electrical system regularly to detect and correct potential problems before they become serious.