Group 30: Electrical system
Diagnostic Trouble Codes
135
FMI 4
Conditions for fault code:
Low rail pressure
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 (see workshop
manual Group 21-26).
FMI 7
Conditions for fault code:
Cylinder balancing exceeding upper threshold. Rail
pressure controller integral part too big.
Possible reason:
•
High pressure pipes rail to injector leakage, see
SID1-6 (FMI 7) for info which injector.
Suitable action:
1.
Check for leakage in the high pressure system.
