Domestic electric vehicle brands usually focus on the vehicle's battery pack and high-voltage wiring harness. The quality of the high-voltage wiring harness is directly related to whether the vehicle can drive normally, and is also related to the safety of the driver and passengers. Therefore, the inspection of electric vehicle high-voltage wiring harness is the most important part of maintenance. Usually, when testing the high-voltage wire harness, the staff first separates the wire harness from the power controller, and then uses a multimeter to test one by one. If the test results are within the specifications, it is qualified. However, most car manufacturers have a 5-year warranty on high-voltage wiring harnesses, which requires our attention.

Special attention should be paid to replacing the brake oil and transmission gear oil of electric vehicles every 2 years or 40,000 kilometers, and replacing the air conditioning coolant every 4 years or 100,000 kilometers. The organic acid coolant also needs to be replaced. Replacement criteria should be based on time or mileage, whichever comes first.

Regarding the maintenance cycle of new energy vehicles, the maintenance cycle is basically once a year or 20,000 kilometers (whichever comes first). As for the maintenance cost in China, it is generally 200~300 yuan/time. This is just the pure testing cost, excluding labor costs and the cost of replacing wearing parts.