Code P0110: IAT Sensor Circuit Failure
NOTE:
For component terminal identification, See Fig 1
. For wiring diagrams, see WIRING DIAGRAMS
section.
- 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 specified IAT sensor terminals. See IAT SENSOR TERMINAL IDENTIFICATION
table. 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.IAT SENSOR TERMINAL IDENTIFICATION
Application Terminals No. 1.5L 1 & 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).
- Turn ignition switch to ON or RUN position. Using a thermometer, check engine compartment ambient temperature. Using scan tool, read IAT sensor temperature. See IAT SENSOR TEMPERATURE
table. If temperatures are not as specified, replace IAT sensor. If temperatures are as specified, go to next step.IAT SENSOR TEMPERATURE
Ambient Temperature Standard Value -4°F (-20°C) -20°C 32°F (0°C) 0°C 68°F (20°C) 20°C 104°F (40°C 40°C 176°F (80°C) 80°C - Disconnect IAT sensor connector. Using DVOM, check for continuity between chassis ground and specified IAT sensor connector terminal. See IAT SENSOR GROUND CIRCUIT TERMINAL IDENTIFICATION
table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.IAT SENSOR GROUND CIRCUIT TERMINAL IDENTIFICATION
Application Terminal No. 1.5L 1 - With IAT sensor connector and PCM connector disconnected, ground PCM connector terminal No. 52. Check for continuity between specified IAT sensor connector terminal and chassis ground. See the IAT SENSOR CONNECTOR VOLTAGE SUPPLY CIRCUIT TERMINAL ID
table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.IAT SENSOR CONNECTOR VOLTAGE SUPPLY CIRCUIT TERMINAL ID
Application Terminal No. 1.5L 2 - Turn ignition switch to ON position. Check voltage between chassis ground and specified IAT sensor connector. Refer to the IAT SENSOR CONNECTOR VOLTAGE SUPPLY CIRCUIT TERMINAL ID table. If voltage is not 4.5-4.9 volts, replace PCM. If voltage is as specified, replace IAT sensor.