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故障现象一辆丰田考斯特(COASTER)车,在正常行驶中发动机故障灯突然点亮。故障诊断连接IT-Ⅱ读取故障代码,调得的故障代码为P0171——系统混合气过稀(燃油修正),而且IT-Ⅱ给出的故障部位有进气系统、排气系统漏气、喷油器堵塞、燃油压力、ECM、A/F传感器等相关电路、PVC阀和软管、MAF和ECT。检查记录故障代码时的定格数据流,分别为:车速104 km/h,发动机转速为3 643 r/min,MAF空气流量为3020 mg/s,ATMOSPHERE PRESSURE(大气压力)为74 kPa,COOLANT TEMP(冷却液温度)为88℃,AFS VOLTAGE
Fault phenomenon A Toyota COSTTER (COASTER) car, in normal driving engine fault light suddenly lit. Fault Diagnosis Connection IT-Ⅱ read the fault code, tune the fault code is P0171 - the system mixture is too thin (fuel correction), and IT-Ⅱ parts of the intake system has given the exhaust system leaks, Injector clogging, fuel pressure, ECM, A / F sensor related circuits, PVC valves and hoses, MAF and ECT. The data flow for checking the fault codes is 104 km / h at vehicle speed, 3 643 r / min at engine speed, 3020 mg / s at MAF air flow, 74 kPa at ATMOSPHERE PRESSURE and COOLANT TEMP (atmospheric pressure) Coolant temperature) 88 ° C, AFS VOLTAGE