| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM connectors 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 air filter housing and is used to monitor temperature of air flowing into intake manifold. DTC is set when ECM detects an open or short in IAT sensor 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 P0105, P0110, P0115 and P0120 are output together, inspect ECM terminal E2 (ground) circuit. Repair as necessary. See appropriate wiring diagram in WIRING DIAGRAMS article.