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

INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [LF, L3]

NOTE:
- Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart.

Resistance Inspection

1. Disconnect the mass air flow sensor connector.

2. Verify that the resistance between MAF sensor terminals D and E is within the specification.






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





Circuit Open/Short Inspection









1. Disconnect the PCM connector.

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

Open circuit

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

- MAF/IAT sensor terminal D and PCM terminal 1AT*1, *2, 1AH*3
- MAF/IAT sensor terminal E and PCM terminal 1AS*1, 1AV*2, 1AA*3

Short circuit

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

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

*1
California emission regulation applicable model
*2
Except for California emission regulation applicable model with LF MTX, L3
*3
Except for California emission regulation applicable model with LF ATX