Fault code information
1 trip MIL
3 drive cycle recovery
Readiness group – None
Freeze frame type – Fuel
Description of component(s)
The rail pressure is measured in the common rail.
Effect on the system
Feedback on the rail pressure control.
* The rail pressure is closed-loop controlled. A comparison is made between the rail pressure demands determined by the ECU and the rail pressure feedback measured by the common rail pressure sensor.
Location of component(s)
Diagnostic condition
This diagnostic runs when the rail pressure operating state is: Pump unit only
Set condition of fault code
The PCI ECU (D420) detects that the actual rail pressure drops suddenly.
Reset condition of fault code
This DTC changes to inactive when the fault is no longer detected. To validate the repair, key the ignition off for at least 15 seconds, key on again. Then start the engine and let it idle for 2 minutes.
Electrical diagram(s)
Technical data
Component check, common rail pressure sensor (F854)
This type of component cannot be checked with a multimeter or oscilloscope. Perform the following to assess the component:
* Monitor/test the component with DAVIE
* Perform the wiring check
Component & wiring check, ECU (D420)
Preparation
* Key off the ignition
* Disconnect connector F854
* Measure on the front side of wiring harness connector F854
Possible causes
An external or internal fuel leakage on the high pressure fuel system components.
Additional information
The rail pressure is closed-loop controlled. A comparison is made between the requested and actual rail pressure measured by the common rail pressure sensor.
The rail pressure is measured in the common rail by the common rail pressure sensor (F854).
When this DTC is active:
* the engine torque is reduced.
* the engine runs in protection mode
