Hyundai Santa Fe (2006 year). Manual — part 450
FL -410
FUEL SYSTEM
DTC P1171 MINIMUM RAIL PRESSURE EXCEEDED
COMPONENT LOCATION
E58ECD38
Fuel Pressure
Regulator Valve
FTS
Rail Pressure Regulator Valve
RPS
LFIG475A
GENERAL DESCRIPTION
E3669CDD
As inputted rail pressure sensor signal, ECM of Commom rail diesel engine controls fuel metering unit(FPRV-intergrated
with high press. pump) and rail pressure control valve(RPRV-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 diagnoses 1) supplying state of low pressure fuel and 2) mechanical operating conditions of high
pressure pump and 3). RPRV 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
E54C6EAC
Rail pressure is controlled by 1)only RPRV or 2)both RPRV and FPRV or 3)only RPRV depending on engine condition.
These three modes are called ’CPC mode’. During transition from one mode to another mode, if rail pressure is below
the minimum rail pressure for each certain engine condition for more than 300ms. P1171 is set then, rail pressure is
controlled by RPRV alone.
DTC DETECTING CONDITION
E8E237BC
Item
Detecting Condition
Possible Cause
DTC Strategy
• Signal monitoring
Enable Conditions
• Engine running
Threshold Value
• If rail pressure is below the minimum rail pressure for
each certain engine condition
Diagnostic Time
• 0.3 sec.
Fuel cut
NO
EGR Off
NO
Fuel Limit
NO
Fail Safe
Check Lamp
NO
• Rail press.
is controlled
by RPRV
• ECM internal
error
• RPRV
component
• FPRV
component
• RPS
componet
DTC TROUBLESHOOTING PROCEDURES
FL -411
MONITOR SCANTOOL DATA
EE0FFC84
1.
Monitoring rail pressure data
1)
Connect Scantool to Data Link Connector (DLC).
2)
Warm engine up to normal operating temperature.
3)
Turn "OFF" electrical devices and A/C.
4)
Monitor "FUEL PRESSURE MEASURED", "FUEL PRESS. S/POINT", "RAIL PRESS. REGULATOR1", "INJ.
PUMP REGULATOR" parameter on the Scantool.
Specification : FUEL PRESSURE MEASURED similar to "FUEL PRESS. S/POINT"
FUEL PRESS. S/POINT : 27 ± 5 Mpa
RAIL PRESS. REGULATOR1 : 16 ± 3%
INJ. PUMP REGULATOR : 34 ± 3%
Fig.1
Fig.1) Monitor "FUEL PRESSURE MEASURED" at idle after warming engine up.
SCMFL6339L
Check if "FUEL PRESSURE MEASURED"data is similar to "FUEL PRESS. S/POINT". Not only former two data
but also "RAIL PRESS. REGULATOR1" and "INJ. PUMP REGULATOR"should be monitored carefully. Although
"FUEL PRESSURE MEASURED" is similar to "FUEL PRESS. S/POINT", if "RAIL PRESS. REGULATOR1" and
"INJ. PUMP REGULATOR" is out of specification, it means wear, leakage, stuck of fuel system.
2.
Monitoring rail pressure data at acceleration(loading condition).
1)
Connect Scantool to Data Link Connector (DLC).
2)
Warm engine up to normal operating temperature.
3)
Turn "OFF" electrical devices and A/C.
4)
Monitor "FUEL PRESSURE MEASURED", "INJ. PUMP REGULATOR","RAIL PRESS. REGULATOR1" param-
eter on the Scantool.
FL -412
FUEL SYSTEM
SPECIFICATION :
Idle(without load)
Accelerating(stall test)
Diagnosis
FUEL PRESSURE
MEASURED
27 ± 5 Mpa
above 75 Mpa
press. increases
INJ. PUMP REGULATOR
34 ± 3%
38 ± 3%
duty increases
RAIL PRESS.
REGULATOR1
16 ± 3%
45 ± 3%
duty increases
Fig.1
Fig.2
Fig.2) Fuel pressure and Fuel pressure regulator valve data at idle.
Fig.3) Fuel pressure and Rail pressure regulator valve data at idle.
Fig.4) Fuel pressure and Fuel pressure regulator valve data at acceleration.
Fig.5) Fuel pressure and Rail pressure regulator valve data at acceleration.
Fig.3
Fig.4
LFIG375A
NOTE
The waveform of fuel pressure regulator valve installed at high pressure pump(fuel detecting MPROP) shows 34 ±
3% duty at idle, duty rises to approx. 38% at acceleration to raise rail pressure.
The waveform of rail pressure regulator valve installed at common rail shows 16 ± 3% duty at idle, duty rises to
approx. 45% at acceleration to raise rail pressure.
DTC TROUBLESHOOTING PROCEDURES
FL -413
VERIFICATION OF VEHICLE REPAIR
E9C74079
After a repair, it is essential to verify that the fault is corrected.
1.
After connecting Scantool select "DIAGNOSTIC TROUBLE CODES(DTCs)" mode.
2.
Clear recorded DTC using Scantool.
3.
Drive the vehicle within DTC "Enable conditions" in "General information".
4.
After selecting "DIAGNOSTIC TROUBLE CODES(DTCs)" mode and check if DTC is recorded again.
5.
Are any DTCs recorded ?
YES
▶
Go to the DTC guide of recorded NO. in Scantool.
NO
▶
System operates within specification.
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