Kia Optima: Engine Control System / Manifold Absolute Pressure Sensor (MAPS) & Intake Air Temperature Sensor (IATS)

Kia Optima DL3 2019-2020 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / Manifold Absolute Pressure Sensor (MAPS) & Intake Air Temperature Sensor (IATS)

Specifications
Specification
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
Description
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
Components Location

1. Manifold Absolute Pressure Sensor & Intake Air Temperature Sensor (MAPS & IATS)


Schematic diagrams
Circuit Diagram

Harness Connector

Repair procedures
Inspection
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

Components Inspection

[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

Removal
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)

Installation
  

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.

ETC (Electronic Throttle Control) System
Specifications Specification Throttle angle (°) Output voltage (V) [Vref = 5.0V] TPS1 TPS2 0 0.5 ...

Engine Coolant Temperature Sensor (ECTS)
Specifications Specification Temperature Resistance (kΩ) °C °F 45 113 244.8 - 281.4 ...

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