What is the fault code for EECU message?
2 Answers
EECU message indicates that the Vehicle Electronic Control Unit (VECU) cannot receive signals from the Engine Electronic Control Unit (EECU). Here is an introduction to EECU: Reasons for EECU message: Loose connectors. The brain of the car: EECU. The computer board in a car consists of a microprocessor (CPU), memory (ROM, RAM), input/output interfaces (I/O), analog-to-digital converters (A/D), as well as shaping, driving, and other large-scale integrated circuits. Integration and miniaturization: The computer board in a car (also known as the control unit) mainly includes the engine computer, automatic transmission computer, body control system computer (ABS, ESP, EBD, BA, etc.), and comfort systems (electric seats, automatic wipers, automatic headlights, automatic air conditioning, sunroof control, central locking, remote key, remote window lift, window rise on lock, etc.). Modern cars use more and more computers, which are increasingly integrated and miniaturized.
When I previously studied automotive circuits, I often dealt with ECU messages. Essentially, fault codes are special signals generated by the ECU when it detects abnormalities. In layman's terms, the ECU is like the brain of a car, constantly monitoring data from hundreds of sensors. For example, if the engine temperature suddenly exceeds the limit, the oxygen sensor signal is abnormal, or the fuel injector response delay exceeds 200 milliseconds, the ECU immediately records the specific fault location and type, turning it into codes like P0171 that we see. These alphanumeric combinations may seem like gibberish, but they actually correspond to precise fault points in the repair manual. When using a diagnostic tool to read messages during car repairs, you're essentially translating the fault diary recorded by the ECU.
