SsangYong Rexton. Manual — part 82
DI07-44
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
Preceding Work: Removal of engine cover
1. Disconnect the fuel pressure sensor connector.
Removal and Installation
Y220_07090
Y220_07092
Y220_07093
Tightening torque
25 ± 2.5 Nm
Tightening torque
40 ± 10 Nm
Tightening torque
40 ± 10 Nm
Notice
• Replace the fuel pipes with new ones.
• Plug the openings of hole in the common rail with
sealing caps.
• Check pressure is low before opening the circuit.
Notice
• Replace the fuel pipes with new ones.
• Plug the openings of hole in the common rail with
sealing caps.
Notice
• Replace the fuel pipes with new ones.
• Plug the openings of hole in the common rail with
sealing caps.
Notice
• Replace the fuel pipes with new ones.
• Plug the openings of hole in the common rail with
sealing caps.
2. Unscrew the nuts and remove the fuel supply main pipe
from the fuel line.
Installation Notice
3. Unscrew the high fuel pressure line nuts and remove the
fuel pipes.
Installation Notice
4. Unscrew the bolts and remove the common rail
asssembly.
Installation Notice
5. Install in the reverse order of removal.
DI07-45
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
Y220_07094
Fuel Pressure Sensor
Fuel pressure sensor on the center of common rail detects instant fuel pressure changes and then sends to ECU. When
received these signals, ECU uses them to control fuel volume and injection time.
The fuel in the rail reaches to sensor diaphragm via blind hole in the pressure sensor and the pressure signal converts to
electrical signal. The signal measured by sensor will be amplified to input to ECU.
This piezo element type sensor changes pressure into electrical signal. Accordingly, when the shape of diaphragm
changes, electrical resistance in the layers on the diaphragm changes then can measure 0.5 ~ 5 V.
• Sensor input voltage: 5 ± 0.1 V
• Output signal voltage of sensor
- 4.055 ± 0.125 V: 1600 ± 15bar
- 0.5 ± 0.04 V: 0 bar
DI07-46
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
Y220_07095
Y220_07096
Y220_07097
<Sensor voltage>
<Circuit diagram of fuel pressuer sensor>
<Operation principle of fuel pressure sensor>
Pres-
sure
Physical
changes
Sensing area
Converts to
electric signal
Electrically
amplyfying
signal
Amplifier
Output
voltage
Pressure (P)
Upper area
Lower area
Ground
Piezo resistance
Pressure sensor
SIG
REF 5V
DI07-47
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
FUEL SYSTEM
DI ENG SM - 2004.4
Y220_07099
Y220_07098
Fuel Temperature Sensor
<Fuel temperature sensor>
<Output characteristics of fuel temperature sensor>
Fuel temperature sensor is a NTC resistor that sends fuel temperature to ECU.
In case of NTC resistor, the resistance lowers if engine temperature rises so the ECU detects lowering signal voltages.
Fuel temperature sensor is installed on the fuel return line to correct pressure after measuring fuel temperature. 5V is
supplied to the sensor and voltage drop by temperature is delivered to ECU to measure the fuel temperature through
analog-digital converter (ADC).
<Circuit diagram of fuel temperature sensor>
HFM Sensor
- Refer to “Intake System”
Crankshaft Position Sensor
- Refer to “Engine Assembly”
Knock Sensor
- Refer to “Engine Assembly”
Camshaft Position Sensor
- Refer to “Engine Assembly”
T
emperature
Resistance
Signal
Ground
Notice
Fuel temp sensor not to be dismounted.
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