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Huaqiang Security Network News ]
Vehicle speed sensor failure phenomenon 1. Intake pressure sensor
The MAP sensor measures the change in absolute pressure in the intake manifold based on the load state of the engine, and turns
The voltage signal is sent to the microcomputer control device together with the speed signal as the basis for determining the basic fuel injection amount of the injector.
Phenomenon in failure
1 can be started, but it is difficult to start.
2 Engine instability occurs at idle speed.
3 Due to excessive fuel injection, the three-way catalytic converter is rapidly aging
Vehicle speed sensor failure phenomenon 2, intake & cooling water temperature sensor
1. Intake air temperature sensor
Phenomenon in failure
1 No ignition timing correction, knocking may occur.
2 Acceleration performance decreases while driving.
3 fuel consumption is high.
2. Water temperature sensor
Phenomenon in failure
1 The engine is unstable and the engine is unstable when it is idle after starting.
2 Sudden flameout during idle speed or driving.
3 The fuel consumption is high, and the production of CO and HC increases.
Vehicle speed sensor failure phenomenon III, throttle position sensor
Phenomenon in failure
1 When the engine speed increases at idle, it is unstable.
2 Acceleration performance decreases while driving.
3CO, HC emissions increased.
4 Fuel consumption increased.
Vehicle speed sensor failure phenomenon 4, crankshaft position sensor
Phenomenon in failure
1 Startup is difficult.
2 The fuel pump is difficult to drive.
3 high pressure sparks are difficult to produce.
4 It is difficult to start, and the engine sometimes turns off during driving.
Vehicle speed sensor failure phenomenon 5, camshaft position sensor
Phenomenon in failure
1MELCO started poorly.
2 Bo Xu, the Siemens system can be started, but the air-fuel ratio and exhaust emissions are poor when the machine is cold.
Vehicle speed sensor failure phenomenon six, oxygen sensor
Phenomenon in failure
1 Air-fuel ratio control is poor.
2 The rapid acceleration performance is degraded, the acceleration force during driving is decreased or the flame is suddenly extinguished.
3 fuel consumption increased.
4CO, HC emissions increased.
Vehicle speed sensor failure phenomenon 7. Knock sensor
Phenomenon in failure
It is difficult for the driver to feel the malfunction, but the control when the knock sensor fails is to advance the ignition.
The angle is delayed by about 10°, so knocking occurs when there is insufficient power or large load during acceleration.
Vehicle speed sensor failure phenomenon eight, speed sensor
Phenomenon in failure
1 There will be engine instability when idling.
2 When the vehicle starts to slow down or stops while driving, there is a momentary pause or flameout.
3 engine acceleration performance decreased.
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