5571 7
UnclassifiedLubrication
What This Code Means
Jammed Valve; Actuator is blocked; Mechanical wearout of the Pressure Relief Valve; Pressure Relief Valve is forced to open too many times; Pressure Relief Valve open for a longer time than the applied limit; Rail pressure exceeds normal operation values; Open evaluation of the Pressure Relief Valve by rail pressure averaging failed
Possible Causes
- •System is unable to unblock the actuator
- •Mechanical wear and tear
- •Mechanical wearout of the Pressure Relief Valve
- •Excessive rail pressure
- •Average rail pressure is outside the expected range
Suggested Actions
- 1System automatically tries to unblock the actuator by closing or opening it fast
- 2Force the Pressure Relief Valve to open by performing a defined rail pressure shock in two steps: 1. Wait for rail pressure build up, 2. Perform pressure shock (only possible in a defined engine speed/injection quantity range)
- 3Monitor the wearout of the PRV by counting the number of times the PRV is opened and accumulating the duration of its opening in every driving cycle (stored in the EEPROM in after run state of the engine)
- 4Open the mechanical Pressure Relief Valve (PRV) to control maximum rail pressure
- 5Classify PRV as open after successful evaluation of the rail pressure gradients, then execute rail pressure averaging continuously
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