If everyone can communicate, but the engine can't communicate, it should be the power supply of the engine computer or the bus system has failed. This needs to be checked step by step, first check the circuit, and then check the bus system.

Automobile engine computer is abbreviated as ECU (Electronic Control Unit). It consists of microprocessor (daoMCU), memory (ROM, RAM), input/output interface (I/O), analog-to-digital converter (A/D) and large-scale integrated circuits such as shaping and driving, just like ordinary intelligent computers. In a simple sentence, "ECU is the brain of a car."