DTC P0112:00 [MZI-3.7]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

DTC P0112:00	IAT sensor circuit low input
DETECTION CONDITION	Indicates that the sensor signal is less than the self-test minimum. The IAT sensor minimum is 0.2 V or 121 °C {250 °F}.
POSSIBLE CAUSE	IAT sensor malfunction Connector or terminal malfunction Short to ground circuit between MAF/IAT sensor terminal F and PCM terminal 1P
Courtesy of MAZDA MOTORS CORP.