When car with chips cannot start, the tester can quickly diagnose whether the lock does not start, whether it is the problem of reading the line, and quickly diagnose the quality within 10 seconds. Intelligent operation, no need to connect to a computer. At the same time, it is a powerful assistant for car electronic maintenance personnel and car locksmiths. Colour:Red Material:PCB Instructions for use:1. Place the induction coil on the front of the ignition switch. 2. Pass the induction loop, insert the key into the ignition switch, turn on the key, and the induction loop will work. 3. The induction loop converts the electromagnetic communication between the key chip and the anti-theft computer into a flashing LED light to let us know the working status of the chip anti-theft system. 4. A. If the induction map does not flash, it means that the anti-theft computer or coil is broken (the anti-theft computer has no signal) B. If the induction ring flashes for a long time, it means that the chip is not suitable for this car, and the anti-theft is activated. (The anti-theft coil searches for the key chip, but it can't be found) C. If the induction loop flashes once, it goes out, indicating that the key chip passes and the anti-theft is released. (The anti-theft coil can find the key chip in one click) Description: 1. Place the coil detector on the ignition switch. 2. Turn on the key, and the light on the coil indicates that the vehicle is working properly. 3. If the light is not on, it indicates that the anti-theft computer ECU is not working properly. Note: The color of the lanyard is random, and the specified color is not accepted; the actual product may have color difference due to different light or display Package Contents: 4 x Car Key ECU Test Coil Checker