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故障现象一辆2010款桑塔纳志俊1.8 L轿车,行驶里程约为7万km。据驾驶人反映,该车高速时加速不畅,并伴有挫车感,同时油耗增加。故障诊断经试车发现故障现象与驾驶人所述一致。连接故障检测仪,接通点火开关并进入发动机控制单元,无故障代码;起动发动机,发动机怠速稳定,观察怠速时的发动机数据流,均正常。考虑到该车行驶里程已达7万km,怀疑火花塞不良或空气滤清器过脏,但驾驶人反映火花塞和空气滤清器是不久前才更换的,于是排除这两者有故障的可能。清洗节气门体和喷油器并进行匹配后试车,故障依旧。用燃油压力表测量怠速时的燃油压力,为280 kPa～290 kPa,略低,由此怀疑燃油泵有故障或燃油滤清器堵塞。更换燃油滤
Symptom A 2010 Santana Zhijun 1.8 L sedan, mileage is about 70,000 km. According to the driver reflected that the car accelerated poor speed, and accompanied by a sense of frustration, while increasing fuel consumption. Troubleshooting After the test found that the fault phenomenon and the driver described. Connect the fault detector, turn the ignition switch and enter the engine control unit, no fault code; start the engine, the engine idle speed stability, observe the engine data flow at idle, are normal. Considering that the car has traveled 70,000 km and suspected poor spark plugs or excessive air filter, the driver reported that the spark plugs and air filters were not changed until recently. Therefore, the possibility of both being faulty could be ruled out. Clean the throttle body and injector and match the test run, the problem persists. The fuel pressure at idle was measured with a fuel manometer, slightly lower than 280 kPa to 290 kPa, and therefore suspected fuel pump failure or fuel filter blockage. Change fuel filter