The on-site inspection of the vehicle involved found that there were traces of fire on the inside of the vehicle involved, and the traces of fire on the left door and the right door were relatively light. Except for part of the left door and part of the right door, the rest of the paint was burnt. The steel frame and parts left by burning are rusted. The glass of the whole vehicle is in a state of melting and falling off. The front and rear combination lamps were both melted and burned. The 2 front tires had burn marks and were partially melted and burned. The vehicle interior, seat surface, seat back, steering wheel, instrument panel, etc. were all burnt out. The engine compartment cover of the vehicle was opened for inspection, and it was found that the engine compartment was in a state of overheating. 2 Determine the ignition point After determining the overfire area, you can try to judge the ignition point. The engine oil circuit was inspected, and it was found that the oil pipe connection was complete and there was no looseness, and no obvious oil leakage from the oil pipe was found. The wiring harness in the engine compartment was inspected, and it was found that the wiring harness of the left headlight had a melting mark, and it was preliminarily judged that the ignition point was at this position. Take out part of the wiring harness in the engine compartment and take it back to the laboratory for further testing.