| 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
Intake Air Temperature (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 a 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, P0106, P0110, P0115 and P0120 are output together, inspect ECM terminal No. 9 (E2) ground circuit. Repair as necessary. See appropriate wiring diagram in WIRING DIAGRAMS article.