Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTIONNOTE: Perform the following inspection only when directed.
Resistance Inspection
1. Disconnect the negative battery cable.
2. Disconnect the MAF/IAT sensor connector.
3. Measure the resistance between the MAF/IAT sensor terminals D and E using an ohmmeter.
- If the IAT sensor is okay, but the PID value is out of specification, perform the "Circuit Open/Short Inspection".
- If not as specified, replace the MAF/IAT sensor. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)
Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Inspect the following harness for open or short circuit. (Continuity check)
Open circuit
- MAF/IAT sensor terminal D (harness-side) and PCM terminal 39 (harness-side)
- MAF/IAT sensor terminal E (harness-side) and PCM terminal 91 (harness-side)
Short circuit
- MAF/IAT sensor terminal D (harness-side) and power supply
- MAF/IAT sensor terminal D (harness-side) and body GND
- MAF/IAT sensor terminal E (harness-side) and power supply