Code 13: Intake Air Temperature Sensor

NOTE: For component terminal identification, see Figure . For WIRING DIAGRAMS, see WIRING DIAGRAMS section.

If using scan tool, go to step 3). Disconnect Intake Air Temperature (IAT) sensor connector. Using a thermometer, check engine compartment ambient temperature. Using DVOM, check resistance between specified IAT sensor terminals. See IAT SENSOR TERMINAL IDENTIFICATION table. Resistance should be 6000 ohms at 32°F (0°C), 2700 ohms at 68°F (20°C) or 400 ohms at 176°F (80°C). If resistance is not as specified, replace IAT sensor. If resistance is as specified, go to next step.

IAT SENSOR TERMINAL IDENTIFICATION

Application	Terminals No.
1.5L	1 & 2

Fig 1: Identifying IAT Component Terminals (1.5L)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA

Using a hair dryer, warm IAT sensor while monitoring DVOM. Resistance should decrease evenly as temperature rises. If resistance remains unchanged, replace IAT sensor. If resistance changes, go to step 4).

Turn ignition switch to ON or RUN position. Using a thermometer, check engine compartment ambient temperature. Using scan tool, read Intake Air Temperature (IAT) sensor temperature. See IAT SENSOR TEMPERATURE table. If temperatures are not as specified, replace IAT sensor. If temperatures are as specified, go to next step.

IAT SENSOR TEMPERATURE

Ambient Temperature	Standard Value
-4°F (-20°C)	-20°C
32°F (0°C)	0°C
68°F (20°C)	20°C
104°F (40°C	40°C
176°F (80°C)	80°C

Disconnect IAT sensor connector. Using DVOM, check for continuity between chassis ground and specified IAT sensor connector terminal. See IAT SENSOR GROUND CIRCUIT TERMINAL IDENTIFICATION table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.

IAT SENSOR GROUND CIRCUIT TERMINAL IDENTIFICATION

Application	Terminal No.
1.5L	1

With IAT sensor connector and PCM connector disconnected, check for continuity between specified IAT sensor connector terminal and PCM connector terminal. See IAT-TO-PCM WIRING HARNESS TERMINAL IDENTIFICATION table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.

IAT-TO-PCM WIRING HARNESS TERMINAL IDENTIFICATION

Application	IAT Connector Terminal No.	PCM Connector Terminal No.
1.5L	2	52

Turn ignition switch to ON position. Check voltage between chassis ground and specified IAT sensor connector. See IAT SENSOR CONNECTOR VOLTAGE SUPPLY CIRCUIT TERMINAL ID table. If voltage is not 4.5-4.9 volts, replace PCM. If voltage is as specified, replace IAT sensor.

IAT SENSOR CONNECTOR VOLTAGE SUPPLY CIRCUIT TERMINAL ID

Application	Terminal No.
1.5L	2