Car electrical diagnostics
Visual inspection
* Check the condition of the battery and terminals.
* Inspect wires and harnesses for damage, corrosion, or melting.
* Check connections and connectors for looseness or corrosion.
Testing and measurements
* Battery check:
*Measure the battery voltage using a voltmeter.
* Conduct battery stress testing using a battery tester.
* Generator testing:
* Check the voltage at the generator terminals with the engine running.
* Carry out diode bridge test and stator breakdown test.
* Starter testing:
* Check the voltage at the starter terminals when starting the engine.
* Perform a current consumption test on the starter.
*Wiring and Component Testing:
* Use a multimeter to check the continuity and resistance of the wires.
* Check all relays and fuses for faults.
* Check sensors and actuators using a scanner or oscilloscope.
Electronic diagnostics
* Scan fault codes:
* Connect the OBD-II scanner to the vehicle’s diagnostic port.
* Read and decipher stored trouble codes.
* Real-time data monitoring:
* Use the scanner to monitor real-time data such as voltage, current, engine speed and temperature.
* Testing of electronic modules:
* Use a scan tool or a dedicated diagnostic tool to check the functionality of electronic modules such as the engine control module or airbag module.
Other diagnostic methods
* Using a diagnostic oscilloscope:
* An oscilloscope can display and analyze electrical signals to help diagnose problems with wiring, sensors and actuators.
*Check using a smoke machine:
* A smoke machine can be used to detect leaks in vacuum hoses and other components.
* Divide and conquer troubleshooting:
* Systematically disconnect components or sections of the circuit to isolate the fault.
Troubleshooting Steps
* Information Gathering: Record the symptoms of the malfunction and the vehicle’s service history.
* Diagnosis: Use the above methods to determine the cause of the problem.
* Repair: Replace or repair faulty components or wiring.
*Retest: Check if the fault is resolved after repair.
* Informing the Client: Explain to the client the diagnosis and repairs performed.