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老吴侃车(之十)----小专题 (一) CHECK ENGINE LIGHT(未完成, 陆续就到)
老吴侃车(之十)----小专题 (一) CHECK ENGINE LIGHT(未完成, 陆续就到)
<HR style="COLOR: #ffffff" SIZE=1><!-- / icon and title --><!-- message -->常言道:台上一分钟, 台下一日功。 这话一点不假。 在准备这个小专题时我深有体会。 经常看到有人提及 CHECK ENGINE LIGHT; 有人说造成的原因很复杂, 有人甚至说可能有上百种。 究竟有多少呢?哪些是重要的, 影响车辆行驶? 哪些只是影响车辆的工况 (耗油, 尾气)?
带着这些一直困扰着我的问题, 留心收集了下面的信息, 跟各位讨论。 1。 我曾经仔细观察过几个不同类型的发动机, 试图数数共有多少传感器接口; 2。 偶然机会找到了一台新发动机的连线图及连线实体 (下图一)。 图中详细标明了连线的接口数, 用途,及各连线的颜色,电参数 (下表一)。3。 在一本书中简易图列了CHECK ENGINE LIGHT的影响因素 (下图二)。 对照表一及图二, 可以看出差别不是很大。
虽然各种车型有差别, 车辆配置发展更新很快, (例如 SUNFIRE 04 在 COOLANT 检测上不但有温度, 还有 COOLANT LEVEL,) 但大致情况差别不大。 也可以由这些信息得出初步结论:引起 CHECK ENGINE LIGHT 的因素不超过 20个。
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2. 图二
3. 表一, 图一线路解释 (黑体与 CHECK ENGINE LIGHT 有关)
1. Power Input Signals(4) // ----Ignition, Battery, Ground, S.E.S Light
2. EST Power (1) ( Electrical spark timing, 分电器, 电子点火时间)
3. Crank Senor (2) (曲轴传感器) // ---- Crank Sensor return, Crank Sensor Signal
4. EST 1 (3)X4
5. EST 2
6. EST 3
7. EST 4
8. Injectors (5) (喷油嘴) // ----Ignition, Inj 1, 2, 3, 4
9. Throttle (8) (进气阀) // ---- TPS 1 Signal, 5 V Ref TPS 2, Return TPS 1, TPS 2 Signal, Throttle Open, Close, 5V Ref TPS 1, Return PTS 2
10. Oil Temp (3) (机油温度) // ----Oil Level Signal, Oil Temp Signal, Return
11. ISUZU Pedal (6) (油门) // ----Return PPS 2, 5V Ref PPs 1, PPS 1 Signal, 5V Ref PPS2, PPS 2 Signal
12. MAF (5) (Mass Air Flow (MAF) 进气) // ----MAF Signal, Ground, Ignition, IAT Signal, IAT Return
13. MAP (3) (Manifold Absolute Pressure (MAP) sensor) // ----Return, MAP Signal, 5V Ref
****[名词解释]The Manifold Absolute Pressure (MAP) sensor is mounted on the intake manifold. The MAP sensor measures the intake manifold pressure. Engine vacuum is related to engine load and RPM changes. A high vacuum signal indicates a low intake manifold pressure. A low vacuum signal indicates a high intake manifold pressure. The higher the pressure signal, the greater the load being placed on the engine.
The MAP sensor voltage is scaled by the PCM to pressure (kPa or psi). A high pressure (atmospheric pressure) produces an output of 4.5 to 5.0 volts, about 95 to 105 kPa (14 to 15 psi). A low pressure (engine vacuum) produces about 0.5 to 0.90 volts, about 37 to 50 kPa (5 to 7psi). The MAP sensor is also used to calculate barometric pressure under certain conditions.
By monitoring the MAP sensor output voltage signal, the PCM determines the manifold pressure and can increase or decrease the injector On-time (or pulse width). The PCM also uses the MAP sensor signal to help control fuel, ignition timing, canister purge duty cycle and EGR operation.
14. Coolant (2)---------(3) // ----Return, Coolant Signal
15. Exhaust Cam (3) // ----12V ref, Exhaust Cam Signal
16. Cam Phaser (2) // ----Cam Phaser Signal, Return
****[名词解释] A vane cam phaser is a device used to optimize the timing of an engine. It allows the engine's valves to remain open longer of close prematurely to improve fuel efficiency, low-end torque and reduces emissions. Since the cam phaser operates using hydraulic oil pressure, any oil leakage will lead to a decrease in engine performance. To ensure adequate performance, a leak test is conducted on each cam phaser using hot engine oil during manufacturing. This project focuses on accommodating various customer applications through the development of a universal leak test and modified stand that uses a safer ambient temperature test fluid instead of hot engine oil to test cam phasers.
17. Front O2 (4) // ----return, O2 Signal, Ignation, Heater Return
18. Rear O2 (4)
19. Class II (3) // ----Class II Data, Signal Ground, Battery
20. Transmission (13) // ----Shift Solenoid A, Shift Solenoid B, force Motor Feed, Force Motor Return, Ignition
----Trans Temp Signal, Trans Temp Return, Trans Pressure bit 1, bit 2, bit 3, 3/2 shift solenoid, TCC Solenoid, TCC Solenoid PWM
21. Prndl 1 (4) // ----Trans Signale bit 1, bit 2, bit 3, Trans Signal Parity
22. Prndle2 (1)
23. VSS (2) // ----VSS return, VSS Signal
24. Fuel Pump Relay (4) // ---- Fuel Pump Relay, Fuel Pump, Ignition, Ground
25. Fuel Pump (2) // ----Ground, Fuel Pump
26. I2U (3) // ----Ignition, Battery, Ground
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