汽车扫描工具PID诊断(现代汽车系统的诊断策略)在本节中,将介绍扫描工具参数(PID)分析的不同技术。由于其速度和准确性,PID分析技术正在迅速流行起来。通过正确地分析不同的扫描仪pid,技术人员可以更快、更准确地到达问题的根源。由于大部分的初步诊断工作都是通过扫描仪完成的,因此这些程序产生了新的术语“驾驶员座椅诊断”。然而,这些技术将无法取代作为每个诊断路径一部分的最终手工测试。它们只是为技术人员指明正确的方向。导论(介绍扫描工具诊断和使用PID或扫描仪参数执行所有诊断的第一部分的相关性)-不同PID背后的操作理论(描述CARB,通用和增强PID之间的区别,FTP) - OBD II通用PID (PID计算和实际值,计算的数据关系,基础注入定时,ECM值替换)- OBD I & II通用PID分析(删除或不删除代码,记录,-燃油输送故障检测(燃油输送问题,进气温度传感器,BARO传感器,发动机负载,RPM PID,短期燃油微调,长期燃油微调,60%的检查发动机灯问题,阻塞学习/集成商,示例1:喷油器故障,示例2:进气垫片问题、燃油状态、点火正时、MAP/MAF、TPS、O2传感器、IAC、闭式节气门、喷油器脉冲宽度、电压功率、喷油器工作周期、燃油微调单元)-测试#1(确定发动机的燃油消耗(丰裕运转、工作周期与燃油微调关系、O2传感器与燃油微调关系、FT和真空泄漏、点火正时和怠速控制、测试结论)-测试# 2(失火检测策略、EGR、点火和机械失火)(失火和OBD2,扫描仪失火检测-节省时间,OBD2 40和80循环失火,点火,喷油器和EGR密度失火,线圈插塞,失火和O2传感器,低氧和二次失火,O2传感器和喷油器失火,漏喷油器,EGR和MAP, a, B, C型失火,测试结论)-测试# 3(空气/燃料比故障)(空气-燃料不平衡,MAF和后O2传感器,开闭环,燃料使能,HC和CO与AF问题的关系,测试结论)-测试# 4 (BARO, MAP & MAF PID analysis) (MAP & valve timing faults, ECM behavior, fuel delivery or duty cycle test, volumetric efficiency, , test conclusion) - Test # 5 (Clogged exhaust) (clogged catalytic converter detection, TPS, MAF and converters, idle and WOT or wide open throttle values, vacuum readings, MAP to WOT chats analysis, engine and MAP vacuum, test conclusion) - Test # 6 (EGR Fault Detection) (EGR and MAP values, ECM reaction to EGR issues, EGR temp sensor, DPFE sensor, EGR and O2-MAP and lift position sensor, EGR and engine pre-loading, EGR and the ECM erroneous high LOAD issues, test conclusion) - Test # 7 (O2 Sensor Heater) (O2 heaters and why?, tough to check O2 heater issues, O2 heater effect on signal output, O2 heater bias voltage, engine off and O2 changing value, test conclusion) - Test # 8 (Resetting Fuel Trims) (resetting injection pulse corrections, long-term and short-term fuel trims, learn condition, Lambda, case study on fuel trims, FT resetting according to manufacturer, test conclusion) - Test # 9 (Engine Cranking Vacuum Test) (MAP/MAF cranking vacuum, vacuum to PID analysis, vacuum leaks, gauge-PID test, sources of leaks, cranking values, test conclusion)