| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
The IAT sensor is a thermistor built into the MAF sensor to monitor temperature of air flowing through MAF sensor. Based on IAT sensor signal, ECM increases fuel injection volume to improve driveability during cold engine operation. If DTC P0110 is set, ECM will operate in fail-safe mode, in which intake air temperature is assumed to be 68°F (20°C). DTC P0110 is set when ECM detects an open or short in IAT sensor circuit. Possible causes are
- IAT Sensor Open Or Short Circuit
- IAT Sensor
- ECM
Note. If DTCs P0110, P0115, P0120 and P1410 are output together, inspect ECM terminal E2 (ground) circuit for an open. Repair as necessary. See appropriate wiring diagram in SYSTEM WIRING DIAGRAMS article.