Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection

INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [13B-MSP]

NOTE:
- Before performing the following inspection, make sure to follow the troubleshooting flowchart. Initial Inspection and Diagnostic Overview

Resistance Inspection

1. Remove the battery cover. Removal and Replacement

2. Disconnect the negative battery cable.

3. Disconnect the MAF/IAT sensor connector.

4. Verify that the resistance between MAF sensor terminals D and E is as indicated in the table while blowing hot air gradually into the IAT sensor part built into the MAF sensor.






- If the monitor item condition/specification (reference) is not within the specification, even though the resistance is within the specification, perform the "Circuit Open/Short Inspection".
- If not within the specification, replace the MAF/IAT sensor. Service and Repair

IAT sensor resistance





IAT sensor characteristics graph (reference)






Circuit Open/Short Inspection

1. Disconnect the PCM connectors.

2. Disconnect the MAF/IAT sensor connector.

3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)






Open circuit

- If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.

- MAF/IAT sensor terminal D and PCM terminal 1AT
- MAF/IAT sensor terminal E and PCM terminal 1AR

Short circuit

- If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.

- MAF/IAT sensor terminal D and body ground
- MAF/IAT sensor terminal D and power supply