2005 > D 2.5 TCI-A > Engine Engine Control(WGT) > P1188 Fuel Pressure Monitoring - Leakage > General Information
DTC P1185 Fuel Pressure Monitoring Malfunction - Maximum Pressure Exceeded
P1186 Fuel Pressure Monitoring Malfunction - Minimum Pressure at Engine Speed Too Low
P1187 Fuel Pressure Monitoring Malfunction - Regulator Valve Stick
P1188 Fuel Pressure Monitoring Malfunction - Leakage
DESCRIPTION
The ECM determines the rail pressure value as a function of the engine’soperating conditions and controls the rail pressure regulator (MPROP) to ensurethat the rail pressure reaches the required value. If the rail pressure isexcessive, the rail pressure regulator opens and a portion of the fuel returnsfrom the rail to the fuel tank via a collector line. If the rail pressureis too low, the rail pressure regulator closes and seals off the high-pressurestage from the low-pressure stage. Rail pressure regulator is integrated inhigh-pressure pump.
DTC DETECTING CONDITION
DTC No Detecting Condition ＆ Limp Home Possible Cause
P1185
P1186
P1187
P1188 Detecting Condition
•
P1185 : The fuel pressure ＞ 1480 bar
•
P1186 : The fuel pressure measured is lower than the minimum pressuremapped at each engine speed.
•
P1187 : The rail pressure regulator is stuck open fully.
•
P1188 : The fuel pressure measured dose not reach to the appropriaterail pressure at each engine speed.
Enable Condition
•
Engine running
•
Engine speed ＞ 700rpm
Limp Home
•
None
–
Injector
–
Fuel filter
–
Rail pressure regulator
–
High pressure pump
–
Fuel leakage in fuel supply
–
ECM
SPECIFICATIONS
High Pressure Pump Normal Parameter
Engine idle state after engine warming up
Rail Pressure 220 ~ 320 bar (22 ~ 32 Mpa)
INSPECTION PROCEDURES
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