SSANGYONG Rexton Y200 Manual page 574

Under high fuel demands, the MAF sensor reads a high mass flow condition, such as Wide Open Throttle (WOT).
The ECM uses this information to enrich the mixture, thus increasing the fuel injector on-time, to provide the
correct amount of fuel. When decelerating, the mass flow decreases. This mass flow change is sensed by the
MAF sensor and read by the ECM, which then decreases the fuel injector on-time due to the low fuel demand
conditions.
To facilitate the installation of the HFM in the intake passage, lubricating agents may be used. However, when
lubricants are used care must be taken to ensure that they do not enter the flow passage and cannot be sucked
in with the air flow.
The following tables show the relationship between MAF and output voltage.
Mass Air Flow (kg/h)
0
10
15
30
60
120
Intake Air Temperature
The Intake Air Temperature (IAT) sensor is a part of Hot Film Air Mass (HFM) sensor and is a thermistor, a resistor
which changes value based on the temperature of theair entering the engine. Low temperature produces a high
resistance, while high temperature causes a low resistance as the following table.
The ECM provides 5 volts to the IAT sensor through a resistor in the ECM and measures the change in voltage to
determine the IAT. The voltage will be high when the manifold air is cold and low when the air is hot. The ECM
knows the intake IAT by measuring the voltage.
The IAT sensor is also used to control spark timing when the manifold air is cold.
Temp. (°C)
-40
-20
0
20
40
60
80
100
120
130
SSANGYONG Y200
Voltage (V) Mass Air Flow (kg/h)
0.95 ~ 1.05
1.28
1.41
1.71
2.16
2.76
R min.(Ω Ω Ω Ω Ω )
35140
12660
5119
2290
1096
565
312
184
114
91
M161 ENGINE CONTROLS 1F2-51
250
370
480
640
800
R nom. (Ω Ω Ω Ω Ω )
39260
13850
5499
2420
1166
609
340
202
127
102
Voltage (V)
3.51
3.93
4.23
4.56
4.82
R max. (Ω Ω Ω Ω Ω )
43760
15120
5829
2551
1238
654
370
222
141
114