Hyundai Santa Fe (2006 year). Manual — part 491
FLA -30
FUEL SYSTEM
MASS AIR FLOW SENSOR
(MAFS)
INSPECTION
ECF3BEA5
FUNCTION AND OPERATION PRINCIPLE
Mass Air Flow Sensor (MAFS) is a hot-film type sensor
and is located in between the air cleaner and the throttle
body. It consists of a tube, a sensor assembly and honey-
comb cell and detects intake air quantity flowing into the
intake manifold. Air flows from the air cleaner assembly
through the honeycomb cell and over the hot film element.
At this time, heat transfer is generated by convection and
this sensor loses its energy. This sensor detects the mass
air flow by using the energy loss and transfers the infor-
mation to the PCM by frequency. The PCM calculates fuel
quantity and ignition timing.
KFCF1021
SPECIFICATION
Air Flow (kg/h)
Output Frequency (Hz)
12.6 kg/h
2,617Hz
18.0 kg/h
2,958Hz
23.4 kg/h
3,241Hz
32.4 kg/h
3,653Hz
43.2 kg/h
4,024Hz
57.6 kg/h
4,399Hz
72.0 kg/h
4,704Hz
108.0 kg/h
5,329Hz
144.0 kg/h
5,897Hz
198.0 kg/h
6,553Hz
270.0 kg/h
7,240Hz
360.0 kg/h
7,957Hz
486.0 kg/h
8,738Hz
Air Flow (kg/h)
Output Frequency (Hz)
666.0 kg/h
9,644Hz
900.0 kg/h
10,590Hz
GASOLINE ENGINE CONTROL SYSTEM
FLA -31
CIRCUIT DIAGRAM
MAFS & IATS
PCM
C13
C30-A
1
2
Main Relay
MAFS Signal
Battery Voltage (B+)
PCM C30-A (47)
3
4
PCM C30-A (44)
Ground
IATS Signal
5
PCM C30-A (53)
Sensor Ground
Chassis Ground
PCM (C30-A)
MAFS & IATS (C13)
P
5
4
3
1
2
After Main Relay
GND
47 - MAFS Signal
44 - IATS Signal
53 - GND
[CIRCUIT DIAGRAM]
[HARNESS CONNECTORS]
[CONNECTION INFORMATION]
Terminal
Connected to
Function
19
14 13 12 11
31
34
35
36
30
10
24
22
65
67
50
74
75
76
77
1
2
3
4
5
SCMF16104L
COMPONENT INSPECTION
1.
Check the MAFS visually.
-
Mounting direction correct.
-
Any contamination, corrosion or damage on con-
nector.
-
Air cleaner’s clogging or wet.
-
MAFS cylinder’s deforming or blocking by any for-
eign material.
2.
Check any leakage on intake system and intercooler
system.
FLA -32
FUEL SYSTEM
INTAKE AIR TEMPERATURE
SENSOR (IATS)
INSPECTION
EF56EBCD
FUNCTION AND OPERATION PRICIPLE
0
20
40
60
80
100
120
-40
-25
-10
5
20
35
50
65
80
95
110 125
Temperature( C)
Resistance(k
)
EGRF238A
Intake Air Temperature Sensor (IATS) is installed inside
the Mass Air Flow Sensor (MAFS) and detects the intake
air temperature. To calculate precise air quantity, correc-
tion of the air temperature is needed because air density
varies according to the temperature. So the PCM uses
not only MAFS signal but also IATS signal. This sensor
has a Negative Temperature Coefficient (NTC) and its re-
sistance is in inverse proportion to the temperature.
SPECIFICATION
Temperature
℃
℉
Resistance (㏀)
-40
-40
100.87
-20
-4
28.58
0
32
9.40
10
50
5.66
20
68
3.51
40
104
1.47
60
140
0.67
80
176
0.33
GASOLINE ENGINE CONTROL SYSTEM
FLA -33
CIRCUIT DIAGRAM
MAFS & IATS
PCM
C13
C30-A
1
2
Main Relay
MAFS Signal
Battery Voltage (B+)
PCM C30-A (47)
3
4
PCM C30-A (44)
Ground
IATS Signal
5
PCM C30-A (53)
Sensor Ground
Chassis Ground
PCM (C30-A)
MAFS & IATS (C13)
P
5
4
3
1
2
After Main Relay
GND
47 - MAFS Signal
44 - IATS Signal
53 - GND
[CIRCUIT DIAGRAM]
[HARNESS CONNECTORS]
[CONNECTION INFORMATION]
Terminal
Connected to
Function
19
14 13 12 11
31
34
35
36
30
10
24
22
65
67
50
74
75
76
77
1
2
3
4
5
SCMF16104L
COMPONENT INSPECTION
1.
Turn ignition switch OFF.
2.
Disconnect IATS connector.
3.
Measure resistance between IATS terminals 4 and 5.
5
4
3
2
1
SCMF16146L
4.
Check that the resistance is within the specification.
Specification: Refer to SPECIFICATION.
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