Kia Carnival (2009+). Manual — part 248

COMPONENT INSPECTION

1. Connect a scantool on Diagnisis Link Connector (DLC).

2. Check MAPS output voltage at idle and IG ON.

Condition

Output Voltage (V)

Idle

0.8V ~ 1.6V

IG ON

3.9V ~ 4.1V

Fuel System

Engine Control System - Intake Air

Temperature Sensor (IATS)

Fuel System

2009 > G 2.7 DOHC >

INSPECTION

FUNCTION AND OPERATION PRICIPLE

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, correction 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 resistance is in inverse proportion to the temperature.

SPECIFICATION

Temperature

Resistance (k!)

°C

°F

-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

CIRCUIT DIAGRAM

COMPONENT INSPECTION

1. Turn ignition switch OFF.

2. Disconnect IATS connector.

3. Measure resistance between IATS terminals 4 and 5.

4. Check that the resistance is within the specification.

Specification: Refer to SPECIFICATION.