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P1188 Fuel Pressure Monitoring-Leakage

General Description

As inputted rail pressure sensor signal, ECM of Commom rail diesel engine controls fuel metering unit(MPROP-intergrated with high press. pump) and rail pressure control valve(PCV-integrated with common rail) in order to maintain optimum rail pressure according to current engine rpm and load.
However when the problem that leads rail pressure to out of target value intended by ECM occurs due to mechanical or electronical reason, ECM limits engine performance and sets DTC by limiting fuel (stops injector operation) in order to prevent engine from being controlled abnormally. ‘rail pressure monitoring error’ is the DTC which diagnose 1).supplying state of low pressure fuel and 2).mechanical operating conditions of high pressure pump and 3). RPCV indirectly based on RPS output voltage and RPS duty. thus, repair relavant to this DTC requires mechanics the total understand of fuel system.
DTC Description
P1188 is set when rail pressure is lower than target rail pressure by more than 250bar for more than 0.8 sec. in condition that rail press. is controlled by rail pressure regulator valve(RPRV) or rail pressure is below the lower limit value(200bar). This code is due to 1)fuel less than target value supplied to common rail or 2)excessive return of fuel supplied to common rail or 3)short to low voltage line in rail press. sensor.
DTC Detecting Condition
Item Detecting Condition Possible Cause
DTC Strategy ● Voltage monitoring (maximum negative rail pressure deviation with closed pressure control valve exceeded) ● fuel pressure regulator valve (close stuck)
● rail pressure regulator valve (open stuck)
● Rail pressure sensor (Output fixed at low voltage line)
Enable Conditions ● Engine running
Threshold Value ● Rail pressure is below target rail pressure by more than 250bar at rail pressure regulator valve(RPRV) operating condition.
● Rail pressure is below minimum limiting value(200bar) at rail pressure regulator valve(RPRV) operating condition.
Diagnostic Time ● 0.8 sec.
Fail Safe Fuel Cut NO
EGR Off NO
Fuel Limit YES
Check Lamp YES

 

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