Why does the engine fault light go off when stepping on the brake?

[LeLuke]

Engine fault light goes off when stepping on the brake due to wiring issues. Electronic control engine fault diagnosis methods: First external then internal. When the engine malfunctions, first check possible fault locations outside the electronic control system. First simple then complex. Check possible fault locations that can be inspected with simple methods first. If no fault is found through visual inspection and instruments or special tools are required for further inspection, prioritize easier checks. First familiar then unfamiliar. Prioritize fault codes in the electronic control system. Think before acting. Prepare before use. Check the performance of some components in the electronic control system and the condition of electrical circuits. Engine maintenance: Use high-quality engine oil and qualified coolant for engine maintenance. Regularly clean radiator scale, remove engine "carbon deposits," replace the vehicle's "three filters" on time, and maintain reasonable engine speed. The engine is the heart of the vehicle, so maintain good driving habits during daily use.