ENGINE CONTROLS PART #4-DIAGNOSIS 发动机控制部分#4-诊断 System Diagnosis and Troubleshooting 系统诊断和故障排除 An Overview of the Self Diagnostic System 自诊断系统概述 When the ECU detects a problem,it can turn on the check engine light to alert the driver that a fault exists in the system.At the same time,the ECU registers a diagnostic code in its keep alive memory so that the faulty circuit can be identified by a service technician at a later time. 当电脑发现故障，检查发动机指示灯点亮警示驾驶员系统存在故 障。同时，电脑在存储器里记录故障码以便技术服务人员稍后可 以查处故障回路
ENGINE CONTROLS PART #4 - DIAGNOSIS System Diagnosis and Troubleshooting An Overview of the Self Diagnostic System When the ECU detects a problem, it can turn on the check engine light to alert the driver that a fault exists in the system. At the same time, the ECU registers a diagnostic code in its keep alive memory so that the faulty circuit can be identified by a service technician at a later time. 发动机控制部分#4-诊断 系统诊断和故障排除 自诊断系统概述 当电脑发现故障，检查发动机指示灯点亮警示驾驶员系统存在故 障。同时，电脑在存储器里记录故障码以便技术服务人员稍后可 以查处故障回路
Fault Detection FAULT DETECTION RANGE 故障检测范围 Principles 故障检测原则 Abnormal Detection Range 不正常检 ② 4. 测范围 温度信号 电压 Normal Range e6BHOA MHL For Dlagnostic System 3. 自诊断系统 正常变化 THW Abnormal Detection 冷却剂温度 Range 正常范围 A Coolant Temperature(F) -60F Normal Range 280F 4.8V 0.1V
Fault Detection Principles 故障检测原则 故障检测范围 温度信号 电压 不正常检 测范围 自诊断系统 正常变化 冷却剂温度 正常范围
Limitations of the Self Diagnostic System 自诊断系统的局限性 .The ECU must see a signal in an abnormal range for more than a given amount of time before it will judge that signal to be faulty.Therefore,many intermittent problems cannot be detected by the ECU. 电脑只有在一定时间以上检测到一个不正常信号才可以判断这个信号是故 障信号。因此，许多间歇性的故障不能被识别。 .When the ECU stores a diagnostic code,the code indicates a problem somewhere in the sensor circuit,not necessarily in the sensor itself Further testing is always required to properly diagnose the circuit. 当电脑储存了一个故障码，这个码显示传感器电路的某些部位有故障，不一 定传感器自身有故障。精确诊断该回路需要更进一步的检测
Limitations of the Self Diagnostic System •The ECU must see a signal in an abnormal range for more than a given amount of time before it will judge that signal to be faulty. Therefore, many intermittent problems cannot be detected by the ECU. •When the ECU stores a diagnostic code, the code indicates a problem somewhere in the sensor circuit, not necessarily in the sensor itself Further testing is always required to properly diagnose the circuit. 自诊断系统的局限性 电脑只有在一定时间以上检测到一个不正常信号才可以判断这个信号是故 障信号。因此，许多间歇性的故障不能被识别 。 当电脑储存了一个故障码，这个码显示传感器电路的某些部位有故障，不一 定传感器自身有故障。精确诊断该回路需要更进一步的检测
.Not all circuits are monitored by the ECU.Just because the ECU generates a normal code does not mean that there are no problems within the electronic control system. 不是所有电路都被电脑监控。仅仅电脑发出了正常码不意味着控制电 路就没有问题。 .Occasionally,diagnostic codes can be set during routine service procedures or by problems outside the electronic control system.Always clear codes and confirm that they reset prior to circuit troubleshooting. 偶尔，诊断代码可以在日常维护过程中或由电子控制系统以外的 故障引起。在电路故障诊断之前必须要进行清码并确认码已经被 重新设置
•Not all circuits are monitored by the ECU. Just because the ECU generates a normal code does not mean that there are no problems within the electronic control system. •Occasionally, diagnostic codes can be set during routine service procedures or by problems outside the electronic control system. Always clear codes and confirm that they reset prior to circuit troubleshooting. 不是所有电路都被电脑监控。仅仅电脑发出了正常码不意味着控制电 路就没有问题。 偶尔，诊断代码可以在日常维护过程中或由电子控制系统以外的 故障引起。在电路故障诊断之前必须要进行清码并确认码已经被 重新设置
Four Systematic Steps In Diagnosis 四个系统性的诊断步骤 常规快速检验 .Routine Quick Checks 自诊断系统的使用 .Use of the Self Diagnostic System 通过迹象排除故障 .Troubleshooting by Symptom Quality Control Check 质量控制检测
Four Systematic Steps In Diagnosis •Routine Quick Checks •Use of the Self Diagnostic System •Troubleshooting by Symptom •Quality Control Check 四个系统性的诊断步骤 常规快速检验 自诊断系统的使用 通过迹象排除故障 质量控制检测
Procedures to Retrieve Trouble Codes E 故障码拾取的步骤 Check Engine Connector SST 检查发动 机连接口 Check Connector 检查端子
Procedures to Retrieve Trouble Codes 故障码拾取的步骤 检查端子 检查发动 机连接口
进入发动机诊断 To enter engine diagnostics: .Locate the check connector under the hood and identify the T(TE1 on late model TCCS)and E1 terminals. 确定发动机罩下检查接口的位置和识别T和E1端子 .Turn the ignition switch to the "on"position and make sure that the check engine light is on. 打开点火点开关到‘ON'位置并确保检查发动机灯打开 .Confirm that the throttle is closed (IDL contact on). .Jumper check connector terminals T(TE1)to E1. 确认节气门关闭 跨线连接T和E1的接线端子
To enter engine diagnostics: •Locate the check connector under the hood and identify the T (TE1 on late model TCCS) and E1 terminals. •Turn the ignition switch to the "on" position and make sure that the check engine light is on. •Confirm that the throttle is closed (IDL contact on). •Jumper check connector terminals T (TE1) to E1. 进入发动机诊断 确定发动机罩下检查接口的位置和识别T和E1端子 打开点火点开关到‘ON’位置并确保检查发动机灯打开 确认节气门关闭 跨线连接T和E1的 接线端子
2位数字码 1位数字码 7 2-Digit Code 1-Digit Code [Normal] [Normal] 026 026sc 0 26 sec. 45052c.451 hmm T or TE Terminal On 故障码 T or TE Terminal On [Abnormal](Trouble codes 12 and 23 are 12和23 [Abnormal](Trouble codes 2 and 3 are displayed.) displayed,.)厂 6 显示 故障码2和3显示 256c. 0.52g0c ).52 sec. 0.520c2.5c.1045e9 4.0r45c 10 04.5 T or TE1 Terminal On T or TE:Terminal On
2位-数字码 1位-数字码 故障码 12和23 显示 故障码2和3显示
超级显示器显示 Super Monitor Display ① ② 错误 正常 Normal Fault E/S OK 宫蓉 E/642 SELECI DINPUT SET 回片际
超级显示器显示 正常 错误
Erasing Long Term Memory 清除长期存储 EFI 15A
Erasing Long Term Memory 清除长期存储