PACCAR MX (2004 Emissions) Fault Code: P228D Common Rail Fuel Pressure Control – Incorrect
PACCAR MX (2004 Emissions) Fault Code: P228D Common Rail Fuel Pressure Control – Incorrect
SET CONDITIONS:
The PCI ECU (D420) detects that the actual rail pressure is more than 200 bar lower than the commanded rail pressure for more than 3 seconds.
DIAGNOSTIC CONDITION:
This diagnostic runs when the rail pressure operating state is: Pump unit only.
CORRESPONDING OBD READINESS MONITOR:
Fuel system monitor
RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected.
REPAIR VERIFICATION:
1. Clear all DTCs.
2. Test drive or operate the vehicle to meet the following conditions:
– Corresponding readiness monitor displays ‘Ready’
– Diagnostic conditions are met
– Set conditions are met
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful
POSSIBLE CAUSES:
1. Only in case this DTC is set after a fuel injection pipe has been renewed; incorrect installation of the fuel injection pipe.
2. Air present in the fuel system. If the fuel system or parts of it have been emptied during maintenance or repair, this DTC may become active temporarily after the engine is started. If the DTC stays inactive when the engine is running, no further investigation is necessary.
3. Malfunction in the low-pressure fuel system
4. An external or internal leakage on the high-pressure fuel system components
5. Common rail pump unit failure
ADDITIONAL INFORMATION:
1. The rail pressure is closed-loop controlled. A comparison is made between the rail pressure commanded by the ECU and the rail pressure feedback measured by the common rail pressure sensor.
2. The actual rail pressure is measured in the common rail by the common rail pressure sensor (F854).
3. P0094 can also be active when this DTC is active.
