SsangYong Rexton. Service manual — part 433
M161 ENGINE CONTROLS 1F2-53
SSANGYONG Y200
Mass Air Flow Sensor Input Voltage Inspection
1. Turn the ignition switch to “ON” position.
2. Measure the signal voltage between the ECM pin No. 103 and No. 104.
Notice: If the measured value is not within the specified value, the possible cause may be in cableor ECM
coupling.
Specified Value
4.7 ~ 5.2 V
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.
Ignition “ON”
Idling
Engine
Status
Specified Value
Application
0.9 ~ 1.1 V
1.3 ~ 1.7 V
(Coolant temperature is
over 70°C)
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 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.
Specified Value
4.7 ~ 5.2 V
5. Measure the voltage between the ECM pin No. 105 and MAF sensor connecter terminal No. 4.
Specified Value
11 ~ 14 V
Notice: If the measured value is not within the specified value, the possible cause may be in cable or Over
Voltage Protection Relay (OVPR).
SSANGYONG Y200
1F2-54 M161 ENGINE CONTROLS
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
YAA1F590
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
M161 ENGINE CONTROLS 1F2-55
SSANGYONG Y200
YAD1F460
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
SSANGYONG Y200
1F2-56 M161 ENGINE CONTROLS
YAD1F470
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.
Failure
Code
Description
Trouble Area
Maintenance Hint
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
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 t ool
•
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
Temperature (°C)
20
80
100
Specified Value (V)
3.57
1.22
0.78
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