DTC P0110: Intake Air Temperature (IAT) Sensor
- Check Power Supply - Turn ignition off. Disconnect IAT sensor harness connector. See Fig 1. Using a voltmeter, measure voltage between IAT sensor harness connector terminal No. 3 (Pink/Black wire) and ground. If voltage is not about 5 volts, repair fault in Yellow/Blue wire as required. If voltage is about 5 volts, go to next step.
- Check Ground Circuit - Turn ignition off. Using an ohmmeter, check continuity between IAT sensor harness connector terminal No. 1 (Black wire) and engine ground. If no continuity exists, repair open in Black wire. If continuity exists, go to next step.
- Check Component
- Ensure IAT sensor is not damaged or contaminated. Check ECM and IAT sensor harness connectors for damage, corrosion or pushed-out pins. Repair if necessary. If no problems are found, ensure ignition is off. Measure resistance between IAT sensor connector terminals as follows:
- With intake air temperature at 68°F (20°C), resistance should be 2100-2900 ohms.
- With intake air temperature at 176°F (80°C), resistance should be 270-380 ohms.
If resistance is not as specified, replace IAT sensor. If resistance is as specified, check ECM and IAT sensor harness connectors for damage, corrosion or pushed-out pins. Repair as necessary and retest.