ERIKC DLLA 147P 747 denso diesel injection nozzle DLLA 147 P747 oil nozzle for 095000-0571

FAQ: What should I do if the high pressure pump fails? The flow rate in the fuel metering unit exceeds the threshold

ERIKC Answer: Symptoms: The fault light is on during the normal driving of the vehicle, and acceleration and powerlessness appear immediately.

Possible Causes:

1) The oil return of the injector is too high to cause high pressure leakage, and the high pressure leakage causes the flow rate in the metering valve to exceed the threshold value; 2) The pressure relief valve on the common rail tube causes high pressure leakage, and the high pressure leakage causes the flow rate in the metering valve to exceed the threshold value; ) The oil metering unit on the pump is working abnormally.

Troubleshooting method:

1) Injector troubleshooting:

2) Measure whether the single-cylinder oil return of the injector is too large. If it is too large, the injector can be replaced for the external-injection injector. For internal fuel injectors, it is necessary to check: a. whether the high-pressure jumper pipe is in place; b. whether there is any scratch on the sealing taper between the fuel injector and the jumper pipe; c. the internal wear of the fuel injector is replaceable. Device.

2) High-pressure fuel rail investigation:

Loosen the fuel rail pressure relief valve connector to see if there is oil. Normally there is no fuel spillage.

3) High-pressure pump troubleshooting:

Method one: replace the new oil pump to do the crossover experiment; Method Two: The high pressure tool measures the pressure build capacity of the oil pump.