What causes the EPC light to illuminate and fuel delivery failure in JAC diesel vehicles?

[Troy]

JAC diesel vehicles experiencing EPC light illumination and fuel delivery failure may have the following causes: 1. Air intake system leaks, causing the engine control unit to detect the issue and trigger the EPC warning light. This situation also extends to avoiding removing the engine oil dipstick or opening the oil filler cap while the engine is running. 2. When the EPC light illuminates, use a decoder for fault diagnosis and troubleshooting. If fault code 17550 appears, indicating load recording value below threshold; or both 17550 and 17961 appear, suggesting unreliable signal ratio between height sensor and intake manifold pressure (potentially caused by a failed intake pressure sensor), inspect the electronic throttle body. If excessive dirt is found, clean the throttle body and perform basic setting 01-04-060. 3. Actual issues in components or wiring of the engine's electronic throttle system can generally be identified through conventional electrical testing methods. 4. Other comprehensive factors: Engine oil must be filled strictly according to specifications, as overfilling affects mixture concentration and may cause abnormal EPC activation; similarly, excessively low cylinder compression pressure can also lead to such faults.