| 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. DTC is set when ECM detects a open or short circuit. ECM will operate in fail-safe mode if DTC P0110 is set. Possible causes are
- IAT sensor open or short circuit.
- IAT sensor.
- ECM.
Note. If DTCs P0110, P0115 and P0120 are output together, inspect ECM terminal E2 (ground) circuit. Repair as necessary. See appropriate wiring diagram in WIRING DIAGRAMS article.