PACCAR MX (2004 Emissions) Fault Code: P128F Common Rail Fuel Pressure Control – Incorrect
PACCAR MX (2004 Emissions) Fault Code: P128F 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 1 second.
DIAGNOSTIC CONDITION:
This diagnostic runs when the rail pressure operating state is: Rail discharge.
RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected.
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).
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