Tool check method

The test lamp inspection method is more suitable for inspecting the wire breakage fault.The use of temporary test lamp method should pay attention to the power of the test lamp is not too large, in the test of the electronic controller control output terminal whether there is output and whether there is enough output, especially careful to prevent the controller overload damage.It is best to test the lamp with a diode.

Intuitive inspection method

When a part of the car electrical system failure, there will be smoke, spark, abnormal sound, smelly coke, high temperature and other abnormal phenomena.Through the human sensory organs of listening, touching, smelling, looking at the automobile wiring harness and electrical appliances for intuitive inspection, and then to judge the location of the fault, thus greatly improving the speed of maintenance.For example, when the car line failure, often appear smoke, spark, abnormal sound, smelly coke, high temperature and other abnormal phenomena.Through visual inspection, the fault location and fault nature can be quickly judged.

Conductor bonding inspection method

Crossing method that is to use a wire will be suspected to have a fault of the line short, observe the instrument pointer change or electrical equipment working conditions, thereby judging whether there is a circuit break or contact bad fault.Crossing refers to the operation of connecting two points of a circuit with a wire, and the potential difference between the two points of the crossover circuit is zero, not short circuit.

Instrument inspection method

The method of using comprehensive fault diagnosis instrument, multimeter, non-wave device, current clamp and other instruments to diagnose automobile circuit faults.For vehicles with electronic control system, the comprehensive fault diagnosis instrument is generally used to find the fault code to confirm the fault range of vehicles.Then use a multimeter, current clamp or no wave device to check the voltage, resistance, current or waveform of the relevant circuit to diagnose the fault point of the wire harness conductor.