Diagnostic Trouble Codes
Group 30: Electrical system
136
FMI 12
Conditions for fault code:
Rail pressure too low. Rail pressure nominal value de-
viates positive from set point value.
Possible reason:
•
Low fuel level.
•
Air gets into the fuel system.
•
High pressure leakage.
•
Low pressure leakage.
•
Blocked fuel filter, pre- and fine filter.
•
Faulty rail pressure sensor.
•
MPROP closed or partly closed or out of charac-
teristic,
•
Rail pressure release valve stuck open or unwant-
ed opening.
•
An injector is stuck open.
•
Faulty high pressure pump.
Suitable action:
1.
Check fuel level, hoses and fuel filter for leakage.
2.
Check fuel pipes for leakage (high pressure pipes,
suction pipes, return pipes).
3.
Change fuel filters, pre- and fine filter.
4.
Check function of rail pressure sensor (see MID
128, PID 164).
5.
Change the rail pressure release valve.
6.
Check MPROP cables and connectors.
7.
Change MPROP valve.
8.
Check if an injector is faulty.
9.
Check both high pressure pumps.
