Hyundai Santa Fe (2006 year). Manual - part 452

FL -418

FUEL SYSTEM

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.

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

DTC TROUBLESHOOTING PROCEDURES

FL -419

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.

VERIFICATION OF VEHICLE REPAIR

EA2EA934

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 ?

FL -420

FUEL SYSTEM

YES

▶

Go to the DTC guide of recorded NO. in Scantool.

NO

▶

System operates within specification.

DTC TROUBLESHOOTING PROCEDURES

FL -421

DTC P1186 FUEL PRESSURE MONITORING-MINIMUM PRESSURE AT
ENGINE SPEED TOO LOW

COMPONENT LOCATION

E68C7240

Refer to DTC P1185.

GENERAL DESCRIPTION

E556BA91

Refer to DTC P1185.

DTC DESCRIPTION

E9E4EDB4

P1186 is set when rail press. is lower than target rail press. by 200bar in condition that rail press. is controlled by fuel
metering unit(MPROP) and fuel flow quantity in High pressure pump reaches to the upper limit value. This code is due
to 1)less than intended fuel supply to common rail or 2)excessive return of fuel supplied to common rail or 3)short to low
voltage line in fuel press. sensor.

DTC DETECTING CONDITION

E0647F0A

Item

Detecting Condition

Possible Cause

DTC Strategy

• Voltage monitoring

Enable Conditions

• Engine running

Threshold Value

• (Case1) Actual rail press. is below the minimum

posible rail press. at certain temp. at fuel
pressure regulator valve(MPROP) operating
condition. - 0.3 sec.

• (Case2) Actual rail press. is below the minimum

posible rail press. at certain temp. at fuel
pressure regulator valve(MPROP) operating
condition and target high press. pump flow is
below min value(-990

㎣

/s) - 2 sec.

Diagnostic Time

• 2 sec.

Fuel cut

NO

EGR Off

NO

Fuel Limit

Case1:

YES

Case

2:

NO

Fail Safe

Check

Lamp

Case1:

YES

Case

3:

NO

• Fuel pressure regulator

valve(close stuck)

• Rail pressure control

valve(open stuck)

• Rail pressure sensor(Output

fixed at high voltage line)

MONITOR SCANTOOL DATA

E9BA4B25

Refer to DTC P1185.