Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTIONResistance Inspection
NOTE: Perform the following inspection only when directed
1. Disconnect MAF/IAT sensor.
2. Measure the resistance between the MAF/IAT sensor terminals D and E using an ohmmeter
- If not as specified, replace the MAF/IAT sensor
- If the MAF/IAT sensor is okay, but PID are out of specification, perform the "Circuit Open/Short Inspection".
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)
2. Inspect the following wiring harnesses for open or short circuit. (Continuity check).
Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- MAF/IAT sensor terminal D (harness-side) and PCM terminal 2E (harness-side)
- MAF/IAT sensor terminal E (harness-side) and PCM terminal 2H (harness-side)
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- MAF/IAT sensor terminal E (harness-side) and power supply.
- MAF/IAT sensor terminal D (harness-side) and power supply.
- MAF/IAT sensor terminal D (harness-side) and body GND.