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.