The reasons and elimination methods for the non-production of high-pressure oil pipes of diesel engines.
First, the cause of the failure.
1.The pump head of the high-pressure oil pump is faulty.
2.Fracture or deterioration of high-pressure tubing.
3.The injector is faulty.
4.The metering unit of the high-pressure oil pump is faulty.
5.The high-pressure oil transfer pump is working abnormally.
6.Abnormal pressure of the common rail (usually pressure relief or failure to open), etc.
7.The control circuit of the high-pressure oil pump is faulty, etc.
8.The electric fuel pump control module is faulty or the electric fuel pump is clogged.
9.The throttle cannot be closed due to a malfunction of the throttle control circuit (main relay or throttle body assembly, wiring harness, etc.).
10.The failure of the crankshaft position sensor caused the engine ECU to fail to receive the crankshaft position signal, resulting in no fuel injection and no ignition.
11.An internal failure in the engine ECU causes the engine ECU to fail to output an injection ignition signal.
12.The engine wiring harness is broken or short-circuited, the sensor and actuator are damaged or the connector is loose, resulting in the failure of the injector to work, resulting in the ignition of the engine without fuel injection.
13.The pressure of the fuel supply system is too low, such as the common rail pressure is too low, the injector is cracked and leaking, etc.
14.Blockage of the air supply system, such as damage to the air flow meter, intake booster pump, etc.
15.The engine temperature is too high or too low, such as damage to the coolant temperature sensor, thermostat, etc., or poor connection, resulting in the engine not working properly.
16.The power supply circuits of crankshaft position sensors, camshaft position sensors, deflagration sensors, water temperature sensors and speed sensors are open or short-circuited.
17.The ignition system primary circuit, ignition coil, crankshaft position sensor signal line is connected incorrectly or the iron is poorly connected, resulting in the engine cannot be ignited normally.
18.The engine cannot work properly due to poor ECU lapping and internal failure of the ECU.
19.The engine timing control system is faulty, such as the timing pulley is broken or installed incorrectly, which causes the engine timing to be incorrect, which affects the normal operation of the engine.
20.Improper adjustment of valve clearance, such as too large or too small valve clearance, broken valve springs, etc., cause the valve to fail to close normally, which will affect the normal operation of the engine.
21.Blocked fuel system, such as blocked fuel filters, fuel pump screens, etc., causing the engine to not work properly.
22.The quality of diesel fuel is not up to standard, such as too high water content in the fuel, too many impurities, etc., resulting in the engine can not work normally.
23.Air leakage in the intake system of the diesel engine, such as damage to the air filter core and turbocharger, etc., leads to air leakage in the intake system, which in turn affects the normal operation of the engine.
24.The diesel engine cooling system is faulty, such as radiator leakage, water pump damage, etc., which causes the engine to overheat and cannot work properly.
25.Failure of the diesel engine lubrication system, such as damage to the oil pump, low oil pressure, etc., resulting in the engine not being able to get enough lubrication to work properly.
26.The failure of the diesel engine intake pressure sensor leads to incorrect engine air intake, which in turn affects the normal operation of the engine.
27.Failure of the exhaust system of the diesel engine, such as blockage of the three-way catalytic converter and damage to the muffler, etc., resulting in poor exhaust and affecting the normal operation of the engine.
28.The failure of the diesel engine fuel injection control system, such as the blockage of the fuel injector and the stuckness of the metering unit of the high-pressure oil pump, etc., lead to the incorrect amount of fuel injection and affect the normal operation of the engine.