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Drives : Nissan NV200 Flies : Rans S6ES
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You need to know what the trouble code means in order to diagnose the fault that is causing it. P0112 doesn't mean a low voltage on the IAT sensor signal. It means the sensor signal is indicating too low a temperature, which actually means the signal voltage is too high.

The most likely cause of a temperature sensor signal voltage being too high is high resistance in the wiring, which could be caused by corroded terminals on the harness connectors or an intermittent break in the sensor signal wire. A high resistance on the sensor ground might cause the code too but I think that can be ruled out in this case because the IAT ground is shared with the MAP sensor. If the sensor ground was bad you'd likely have trouble code relating to the MAP or TPS logged as well as the IAT code.

Good luck tracing the fault.

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