Discussion on the Failure of Fuel Gauge Solenoid Valve

Discussion: Fuel metering solenoid valve failure, the engine can hit the fire? Is there any impact on the performance of the engine?

When the fuel gauge solenoid valve fails (eg unplugged its plug), the engine can not be ignited and can not be generalized and should be considered on a case-by-case basis even with the same electronic control system (eg Bosch CRS 2.0 ), Some models can hit the fire, and some models can not, mainly depends on the system control strategy. The following specific examples.

(1) Great Wall GW2.8TC supercharged common rail diesel engine (Bosch's CRS2.0 system)

The engine fails to start and operate when the fuel metering solenoid valve fails.

When the proportion of fuel metering solenoid valve failure such as stuck, unable to open, resulting in high-pressure fuel can not enter the fuel rail, resulting in such failures occur mostly due to impurities in the fuel, the fuel metering proportional valve can be cleaned; fuel metering ratio Solenoid valve and ECU connection line open circuit, resulting in the ECU can not fuel proportional solenoid valve control, therefore, the engine flameout or can not start.

Description: The car fuel metering solenoid valve is normally closed.

(2) Bosch Common Rail System of Yuchai and Weichai Guo â…¢ Diesel Engine

Using normally open (the default state is fully open).

Figure 8 normally open fuel metering solenoid valve fuel supply characteristics

When the fuel metering solenoid valve fails, the engine can start and operate normally (limp home - Limp

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When the ECU determines that the fuel metering valve has failed (such as a damaged fuel metering valve, open and shorted drive lines), the ECU takes a series of measures:

â‘  light fault light;

â‘¡ fault code generated P0251, P0252, P0253, P0254, P025C, P025D;

③ high fuel pressure, pressure limiting valve was washed away; (hands were placed on the return pipe and the common rail, can clearly feel the temperature difference of about 50 °)

â‘£ diagnostic display rail pressure is located in the range of 700-760bar, with increasing speed and increase;

⑤ limit the engine speed (1700rpm / min or so, by controlling the amount of fuel injection), within the limits, the throttle still work;

â‘¥ turn off the ignition switch, the fuel pressure relief valve closed, back to normal;

⑦ If the engine start-up process has entered this strategy, it can still start and there is no obvious feeling.

(3) Yuchaiguo â…¢ diesel common rail system Delphi

The engine fails to start and operate when the fuel metering solenoid valve fails. When the ECU determines that the fuel metering valve has failed (such as the fuel metering valve is damaged, the open and short circuit of the drive line), the ECU

Take a series of measures:

Machine or unable to start; â‘¡ produce fault code: P0251, P0253, P0255.

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