What does the U1218 fault code mean?
1 Answers
U1218 is a fault code related to the ECU (Electronic Control Unit). Here is more relevant information: ECU (Electronic Control Unit): 1. The ECU's operating voltage range is generally between 6.5-16V (with internal voltage stabilization), operating current between 0.015-0.1A, and operating temperature between -40°C to 80°C. It can withstand vibrations below 1000Hz, making the probability of ECU failure very low. The CPU is the core component of the ECU, responsible for computation and control functions. While the engine is running, the ECU collects signals from various sensors, performs calculations, and converts the results into control signals to manage the operation of controlled components. 2. The ECU also controls the memory (ROM, RAM), input/output interfaces (I/O), and other external circuits. The program stored in the ROM memory is based on precise calculations and extensive experimental data. During engine operation, this built-in program continuously compares and calculates with the signals collected from various sensors. 3. The results of these comparisons and calculations control multiple engine parameters such as ignition, air-fuel ratio, idle speed, and exhaust gas recirculation. Additionally, the ECU has self-diagnostic and protective functions. When a fault occurs in the system, it automatically records the fault code in the RAM and implements protective measures by reading substitute programs from the built-in program to keep the engine running, allowing the vehicle to be driven to a repair shop.
