论文部分内容阅读
故障现象一辆丰田卡罗拉1.6 L轿车,搭载1ZR发动机,热机后发动机怠速转速高达2 200 r/min。故障诊断观察发动机冷机与热机时的怠速情况,发现冷机时发动机怠速转速为2 500 r/min,热机时发动机怠速转速为2 200 r/min。热机时接通前照灯与空调,发动机怠速转速仍保持2 200 r/min。与驾驶人沟通得知,该车最近做过1次维护,并且故障是在维护后出现的。难道故障与这次维护有关?打开发动机室盖,检查发动机的外围线束情况,未发现异常。
Fault phenomenon A Toyota Corolla 1.6 L sedan, equipped with 1ZR engine, the engine idle speed up to 2 200 r / min. Troubleshooting Observe engine idle speed and engine idle speed. It is found that the idle speed of the engine is 2 500 r / min when the engine is cold and the engine idle speed is 2 200 r / min when the engine is cold. Turn on the headlights and air-conditioners when the engine is warm, and the engine idle speed remains at 2 200 r / min. Communication with the driver that the car has done a maintenance, and the failure occurred after maintenance. Is the fault related to this maintenance? Open the engine room cover, check the external wiring harness of the engine, found no abnormalities.