SsangYong: Engine Euro 4. Instruction - page 36

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

5

1520

COOLING SYSTEM

D27DTP/D27DT (EU4) SM - 2006.08

D27DTP/D27DT (EU4)

ENGINE

FUEL

I

N

T

AKE

EXHAUST

PRE-HEA

TING

LUB

COOLING

SWITCHABLE

ECU

DIAGNOSIS

Water Pumps for D27DTP (POWER UP) Engine and D27DT Engine

Water Pump for D27DT Engine

Water Pump for D27DTP (POWER UP) Engine

Gasket

Coolant

inlet pipe

Thermostat

Tube

Dowel pin

Water pump

housing

Water pump

bearing housing

Thermostat
Start to open: 0.1 mm at 85°C
Fully opened: 8 mm at 100°C

Tube

O-ring

Water pump

housing

Dowel pin

Flange bolt
Tightening torque: 10 Nm

±

1Nm

Water pump

bearing housing

Coolant

inlet pipe

Gasket

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

6

6820

COOLING SYSTEM

D27DTP/D27DT (EU4) SM - 2006.08

D27DTP/D27DT (EU4)

A/C REFRIGERANT PRESSURE SENSOR (D27DTP) AND
TRIPLE PRESSURE SWITCH (D27DT)

2. A/C PRESSURE SWITCH: FOR D27DTP (POWER UP) ENGINE

Overview

This senses the A/C refrigerant pressure continuously and converts it to voltage value which is then sent to ECU for
the optimum control.

Function: Stopping A/C compressor

For more details, refer to “Refrigerant Pressure Sensor”.

Refrigerant pressure sensor

For the vehicle equipped with D27DT engine, there is triple pressure switch on the receiver drier. For the vehicle
equipped with D27DTP (POWER UP) engine, the pressure sensor is installed.

The A/C refrigerant pressure sensor monitors the refrigerant pressure of the air conditioner and sends that informa-
tion to ECU for the optimum control.

1. A/C TRIPLE PRESSURE SWITCH: FOR D27DT ENGINE

HIGH/LOW pressure switch

It check the A/C line for clogging or gas penetration to stop the A/C compressor or to control the high-speed fan
to protect the compressor from damage.

Intermittent pressure switch

When the pressure in the A/C line is over a certain value (14 kgf/cm

2

), it sends a signal to operate the cooling fan.

Triple pressure switch

A/C SW

HIGH pressure

SW (NC)

LOW pressure

SW (NC)

Triple pressure SW

Intermittent pressure

SW (NO)

GND

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

7

6820

COOLING SYSTEM

D27DTP/D27DT (EU4) SM - 2006.08

D27DTP/D27DT (EU4)

ENGINE

FUEL

I

N

T

AKE

EXHAUST

PRE-HEA

TING

LUB

COOLING

SWITCHABLE

ECU

DIAGNOSIS

Output Voltage

Functions of Refrigerant Pressure Sensor (D27DTP)

The refrigerant pressure sensor continuously monitors the refrigerant pressure in the A/C system to control the A/C
compressor under the following conditions:

Conditions for shutting off the A/C compressor

• Coolant temperature: Below -20°C or over 115°C

• For 4 seconds after starting the engine

• If the engine rpm is below 650 rpm or above 4500 rpm

• Sudden acceleration of vehicle

• Operation A/C refrigerant pressure sensor

- The compressor is turned off when the refrigerant pressure is below 2.0 kgf/cm

2

and is turned on again when the

pressure is over 2.4 kgf/cm

2

.

- The compressure is turned off when the refrigerant pressure is over 30 kgf/cm

2

and is turned on again when the

pressure is below 21.4 kgf/cm

2

.

Conditions for Shutting Off the A/C Compressor

Pressure (kgf/cm

2

)

Output voltage (V)

Pressure (kgf/cm

2

)

Output voltage (V)

0

4

8

12

16

0.5

1.0

1.5

2.0

2.5

20

24

28

32

3.0

3.5

4.0

4.5

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

8

6820

COOLING SYSTEM

D27DTP/D27DT (EU4) SM - 2006.08

D27DTP/D27DT (EU4)

3. NEW DTCS FOR A/C REFRIGERANT SENSOR

P0530

P0532

P0533

Air Conditioner
Refrigerant
Sensor Supply
Power Fault

Air Conditioner
Refrigerant
Pressure Signal
Circuit Short

Excessive Air
Conditioner
Refrigerant
Pressure

- Causes

• There is electric problem in the air conditioner’s

pressure sensor.

- Check the sensor’s specifications and ECU pin.

• Power: 5V ......... ECU Pin #B29

• Sensor signal .... ECU Pin #B41

• Sensor GND ...... ECU Pin #B36

• Actual range: 2.0 kgf/cm

2

(0.75V) ~ 32 kgf/cm

2

(4.5V)

• Resistance: 51K

Ω (signal terminal and ground)

• Output signal

0.5V ................... 0.0 kgf/cm

2

4.5V ................... 32.0 kgf/cm

2

- Actions

• Check the sensor’s resistance and wiring.

• Visually check the unit and replace if necessary.

- Causes

• There is electric problem in the air conditioner's

pressure sensor.

- Check the sensor’s specifications and ECU pin.

• Power: 5V ......... ECU Pin #B29

• Sensor signal. ... ECU Pin #B41

• Sensor GND ...... ECU Pin #B36

• Actual range: 2.0 kgf/cm

2

(0.75V) ~ 32 kgf/cm

2

(4.5V)

• Resistance: 51K

Ω (signal terminal and ground)

• Output signal

0.5V ................... 0.0 kgf/cm

2

4.5V ................... 32.0 kgf/cm

2

- Actions

• Check the sensor’s resistance and wiring.

• Visually check the unit and replace if necessary.

- Causes

• There is electric problem in the air conditioner’s

pressure sensor.

- Check the sensor’s specifications and ECU pin.

• Power: 5V ......... ECU Pin #B29

• Sensor signal .... ECU Pin #B41

• Sensor GND ...... ECU Pin #B36

• Actual range: 2.0 kgf/cm

2

(0.75V) ~ 32 kgf/cm

2

(4.5V)

• Resistance: 51K

Ω (signal terminal and ground)

• Output signal

0.5V ................... 0.0 kgf/cm

2

4.5V ................... 32.0 kgf/cm

2

- Actions

• Check the sensor’s resistance and wiring.

• Visually check the unit and replace if necessary.

Engine

Malfunction

Indicator

light

DTC

Trouble

Limp

Home

Mode

Delayed

Engine

Stop

Torque

Reduction

(max.

20%)

Help

Torque

Reduction

(max.

50%)

Immedi-

ately

Engine

Stop

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