SsangYong Rexton. Service manual — part 409

M162 ENGINE CONTROLS 1F1-53

SSANGYONG Y200

Engine

Status

Application

Specified Value

0.9 ~ 1.1 V

1.3 ~ 1.7 V

(Coolant temperature

is over 70 °C)

Ignition “ON”

Idling

Specified Value

4.7 ~ 5.2 V

Notice: If the measured value is not within the specified value, the possible cause may be in cable or MAF
sensor in itself. Perform the 5 volt power supply inspection procedures.

Mass Air Flow Sensor Input Voltage Inspection

1. Turn the ignition switch to “ON” position.

2. Measure the signal voltage between the ECM pin

Mass Air Flow Sensor 5 volt Power Supply Inspection

1. Turn the ignition switch to “OFF” position.

2. Disconnect the HFM sensor connector.

3. Turn the ignition switch to “ON” position.

4. Measure the voltage between the ECM pin No. 108 and MAF sensor connecter terminal No. 3.

Notice: If the measured value is not within the specified value, the possible cause may be in cableor ECM
coupling.

5. Measure the voltage between the ECM pin No. 105 and MAF sensor connecter terminal No. 4.

Notice: If the measured value is not within the specified value, the possible cause may be in cableor ECM
coupling.

Mass Air Flow Sensor 12 volt Power Supply Inspection

1. Turn the ignition switch to “OFF” position.

2. Disconnect the HFM sensor connector.

3. Turn the ignition switch to “ON” position.

4. Measure the voltage between the ECM pin No. 105 and MAF sensor connecter terminal No. 2.

Notice: If the measured value is not within the specified value, the possible cause may be in cable or Over
Voltage Protection Relay (OVPR).

Specified Value

4.7 ~ 5.2 V

Specified Value

11 ~ 14 V

SSANGYONG Y200

1F1-54 M162 ENGINE CONTROLS

ENGINE COOLANT TEMPERATURE (ECT) SENSOR

YAD1F450

Engine Coolant Temperature (ECT) sensor detects coolant temperature and supplies information to the ECM. It is
composed of metal housing with two NTC resistor, 4 pin connector. The ECM provides a 5 volt signal to the ECT
sensor through a dropping resistor. When the engine is cold, the ECT sensor provides high resistance, which the
ECM detects as a high signal voltage. As the engine warms up, the sensor resistance becomes lower, and the
signal voltage drops. At normal engine operating temperature, the ECT signal will measure about 1.5 to 2.0 volts.

The ECM uses information about coolant temperature to make the necessary calculations for:

•

Fuel delivery

•

Ignition control

•

Knock sensor system

•

Idle speed

•

Torque converter clutch application

•

Canister purge

•

Cooling fan operation

•

Others

1 Artificial Resin Housing
2 Metal Housing
3 NTC (Negative Temperature Coefficient)

Resistor

4 Connector
5 Engine Coolant Temperature Sensor

M162 ENGINE CONTROLS 1F1-55

SSANGYONG Y200

Temperature (°C)

-40

-30

-20

-10

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

Resistance (

Ω

Ω

Ω

Ω

Ω

)

48,550

27,000

15,570

9,450

5,890

3,790

2,500

1,692

1,170

826

594

434

322

243

185

143

111.6

88

71.2

Voltage (V)

4.90

4.82

4.70

4.52

4.43

3.96

3.57

3.14

2.70

2.26

1.86

1.51

1.22

0.98

0.78

0.63

0.50

0.40

0.33

YAD1F460

SSANGYONG Y200

1F1-56 M162 ENGINE CONTROLS

Engine coolant

temperature sensor low

voltage

Engine coolant

temperature sensor high

voltage

Engine coolant

temperature sensor

plausibility

Engine coolant

temperature insufficient

for closed loop fuel

control

YAD1F470

Failure

Code

Description

Trouble Area

Maintenance Hint

ECT sensor short circuit to

ground or open

ECT sensor short circuit to

power

Malfunction in recognition of

ECT

When drop to about 50 ° C

below after warm up

Malfunction in recognition of

ECT

When minimum temperature

for lambda control after

warm up

•

Monitoring the actual coolant temperature

through scan tool

•

Inspection the ECM pin 78, 79 about

short circuit or open with bad contact

•

Inspection the ECT sensor

•

Inspection the ECM

00

01

02

06

Circuit Description

The ECT sensor uses a thermistor to control the signal voltage to the ECM. The ECM supplies a voltage on the
signal circuit to the sensor. When the engine coolant is cold, the resistance is high; therefore the ECT signal
voltage will be high

Engine Coolant Temperature Sensor Inspection

1. Turn the ignition switch to “ON” position.

2. Measure the voltage between the ECM pin No. 78 and No. 79.

Temperature (°C)

20

80

100

Specified Value (V)

3.57

1.22

0.78