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DTC P0110: Intake Air Temperature (IAT) Sensor Circuit Failure

NOTE: IAT sensor is built into Volume Airflow (VAF) sensor. For DTC P0110 test purposes, VAF sensor will be referred to as IAT sensor. For terminal identification, see VAF sensor under TERMINAL IDENTIFICATION  . For circuit and wire color identification, see WIRING DIAGRAMS article.
  1. If using scan tool, go to step 3). Disconnect IAT sensor connector. Using a thermometer, check engine compartment ambient temperature. Using DVOM, check resistance between IAT sensor terminals No. 5 and 6. Resistance should be 6000 ohms at 32°F (0°C), 2700 ohms at 68°F (20°C) or 400 ohms at 176°F (80°C). If resistance is not as specified, replace IAT sensor. If resistance is as specified, go to next step.
  2. Using a hair dryer, warm IAT sensor while monitoring DVOM. Resistance should decrease evenly as temperature rises. If resistance remains unchanged, replace IAT sensor. If resistance changes, go to step 4).
  3. Turn ignition switch to ON or RUN position. Using a thermometer, check engine compartment ambient temperature. Using scan tool, read IAT sensor temperature (item 13). Compare both readings. If readings are not about the same, replace IAT sensor. If readings are about the same, turn ignition off and go to next step.
  4. Disconnect IAT sensor connector. Using DVOM, check for continuity between chassis ground and IAT sensor connector terminal No. 5. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  5. On 3000GT, go to next step. On Montero, turn ignition switch to OFF position. With IAT sensor connector disconnected, disconnect PCM connector. Ground PCM connector terminal No. 62. Check for continuity between IAT sensor connector terminal No. 6 and chassis ground. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  6. Reconnect PCM connector. Turn ignition switch to ON position. Check voltage between IAT sensor connector terminal No. 6 and chassis ground. If voltage is not 4.5-4.9 volts, replace PCM. If voltage is as specified, replace IAT sensor.
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