An 8-ton Guosan Dongfeng Tianjin ISDE electronically controlled common rail engine is difficult to start when it is cold, and the instrument displays fault code 0559. It can start without flameout after the oil circuit exhausts air, but it is difficult to start after 10 minutes of flameout of rail pipe.
Inspection of circuit fault and sensor fault:
The C80 is connected to the 16 pin round head diagnostic connector of ECM and displays the current fault code 0559. The common rail pressure sensor detects that “the fuel pressure in the common rail pipe is too low”, the rail pressure cannot be established and the engine is difficult to start.
1. Turn off the key switch, pull out the plug of the common rail pressure sensor, turn on the key switch, and use a multimeter to measure the voltage between the power pin and the loop pin in the plug of the rail pressure sensor, which is 4.99v, and the measured value meets the requirements.
2. Remove the engine ECM harness plug and measure the continuity between any two points of the power contact, circuit contact and signal contact of the rail pressure sensor; Basically, the problems in the circuit of the common rail pressure sensor are eliminated. Next, check the low-pressure oil circuit of rail pipe.
3. Check the straight pipes of the fuel tank and the connecting pipes of the low-pressure oil circuit, and replace the oil-water separator and diesel secondary filter. It is still difficult to start after the low-pressure oil circuit is vented. It is suspected that it is a problem with the fuel metering unit of the high-pressure pump. Pull out the plug of the metering unit on the high-pressure oil pump and measure the resistance of its two contacts to 3.1 Ω, which also meets the range of 2.0-4.5 Ω.
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