Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
IAT Sensor Resistance Inspection1. Disconnect the MAF/IAT sensor connector.
Specifications:
2. Measure the resistance between MAF/IAT sensor terminals A and F using an ohmmeter.
- If not as specified, replace the MAF/IAT sensor.
- If the IAT sensor is okay, but the IAT PID is out of specification, perform the "IAT Sensor Circuit Open/Short Inspection".
IAT Sensor Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)
2. Connect the SST (104 Pin Breakout Box) without connecting to the PCM as shown.
3. Tighten the connector attaching bolt.
Tightening torque: 3.0 - 5.4 N.m {30 - 58 kgf.cm, 27 - 48 in.lbf}
4. Inspect the following wiring harness for open or short (Continuity check).
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- MAF/IAT sensor terminal A (harness-side) and 104 pin breakout box terminal 91
- MAF/IAT sensor terminal F (harness-side) and 104 pin breakout box terminal 39
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- MAF/IAT sensor terminal A (harness-side) and power supply
- MAF/IAT sensor terminal F (harness-side) and power supply
- MAF/IAT sensor terminal F (harness-side) and body ground