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

INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION

NOTE: Before performing the following inspection, make sure to follow the troubleshooting flowchart. (See FOREWORD.) Foreword

Resistance Inspection
1. Disconnect the MAF/IAT sensor connector.




2. 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.

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 5K
- MAF/IAT sensor terminal E and PCM terminal 4U

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