Kia Optima: Engine Control System / Manifold Absolute Pressure Sensor (MAPS) & Intake Air Temperature Sensor (IATS)
Specifications
| Manifold Absolute Pressure Sensor (MAPS) |
Pressure
|
Output Voltage (V)
|
kPa
|
kgf/cm²
|
psi
|
20
|
0.2
|
2.9
|
0.79
|
46.7
|
0.47
|
6.77
|
1.84
|
106.7
|
1.03
|
14.7
|
4.2
|
| Intake Air Temperature Sensor (IATS) |
Temperature
|
Resistance (kΩ)
|
°C
|
°F
|
-40
|
-40
|
40.93 - 48.35
|
-20
|
-4
|
13.89 - 16.03
|
0
|
32
|
5.38 - 6.09
|
10
|
50
|
3.48 - 3.90
|
20
|
68
|
2.31 - 2.57
|
40
|
104
|
1.08 - 1.21
|
50
|
122
|
0.76 - 0.85
|
60
|
140
|
0.54 - 0.62
|
80
|
176
|
0.29 - 0.34
|
Description and operation
| Manifold Absolute Pressure Sensor (MAPS) |
| • |
Installed on the surge tank, Manifold Absolute Pressure Sensor (MAPS)
is a speed-density type sensor that senses absolute pressure of the surge
tank and transfers the analog signal proportional to the pressure to the
ECM. By using this signal, the ECM calculates the intake air amount and
engine speed.
|
| • |
The MAPS consists of a piezo-electric element and a hybrid IC amplifying
the element output signal. This element, a silicon diaphragm type, features
pressure sensitive variable resistor effect of semi-conductor.
|
| • |
Due to 100% vacuum status and manifold pressure applied to both sides
of the sensor, this sensor can output analog signal by using the silicon
variation proportional to pressure change.
|
| Intake Air Temperature Sensor (IATS) |
| • |
Intake Air Temperature Sensor (IATS) is included inside Manifold Absolute
Pressure Sensor and detects the intake air temperature.
|
| • |
To calculate precise air quantity, correction of the air temperature
is needed because air density varies according to the temperature.
So the ECM uses not only MAPS signal but also IATS signal.
|
| • |
This sensor has a Negative Temperature Coefficient (NTC) and its resistance
is in inverse proportion to the temperature.
|
Components and components location
1. Manifold Absolute Pressure
Sensor & Intake Air Temperature Sensor (MAPS & IATS)
|
|
Schematic diagrams
Harness Connector
Repair procedures
| 1. |
The engine control system can be more quickly diagnosed for troubles
by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")
KDS provides the following information.
| (1) |
Self diagnosis : Inspects and displays diagnostic trouble code
(DTC)
|
| (2) |
Sensor data : Checks the system input/output value status
|
| (3) |
Forced operation : Checks the system operating status
|
| (4) |
Additional function : Controls system options, zero point adjustment
and other functions
|
|
[MAPS]
| 1. |
Connect the KDS on the Data Link Connector (DLC).
|
| 2. |
Measure the output voltage of the MAPS at idle and IG ON.
Pressure
|
Output Voltage (V)
|
kPa
|
kgf/cm²
|
psi
|
20
|
0.2
|
2.9
|
0.79
|
46.7
|
0.47
|
6.77
|
1.84
|
106.7
|
1.03
|
14.7
|
4.2
|
|
[IATS]
| 1. |
Turn the ignition switch OFF.
|
| 2. |
Disconnect the IATS connector.
|
| 3. |
Measure resistance between the IATS terminals 3 and 4.
|
| 4. |
Check that the resistance is within the specification.
Temperature
|
Resistance (kΩ)
|
°C
|
°F
|
-40
|
-40
|
40.93 - 48.35
|
-20
|
-4
|
13.89 - 16.03
|
0
|
32
|
5.38 - 6.09
|
10
|
50
|
3.48 - 3.90
|
20
|
68
|
2.31 - 2.57
|
40
|
104
|
1.08 - 1.21
|
50
|
122
|
0.76 - 0.85
|
60
|
140
|
0.54 - 0.62
|
80
|
176
|
0.29 - 0.34
|
|
| 1. |
Disconnect the negative battery terminal.
|
| 2. |
Remove the air duct (A).
|
| 3. |
After disconnecting the connector (A), remove the MAPS & IATS by loosening
the bolt (B).
|
Tightening torque :
9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)
|
|
| • |
Tighten the component to the specified torque.
|
| • |
Note that internal damage may occur when the component is dropped.
If the component has been dropped, if it is damaged inspect before
installing.
|
|
| 1. |
Install in the reverse order of removal.
|
Specifications
Specification
Throttle angle (°)
Output voltage (V) [Vref = 5.0V]
TPS1
TPS2
0
0.5
...
Specifications
Specification
Temperature
Resistance (kΩ)
°C
°F
45
113
244.8 - 281.4
...
Other information:
Components and components location
Components
1. Radiator
2. Radiator upper mounting bracket
3. Radiator upper hose
4. Radiator lower hose
5. Radiator lower mounting insulator
6. Radiator air guard
7. Degassing hose and pipe
...
Master Warning light
• This warning light informs the driver of the following situations
- Forward Collision-Avoidance Assist malfunction
- Blind-Spot Collision Warning radar blind
- Lamp malfunction
- High Beam Assist malfunction
- Tire Pressure Monitoring System (TPMS) malfunction
- Ele ...
ETC (Electronic Throttle Control) System
Engine Coolant Temperature Sensor (ECTS)