P0112

Note: The MAF sensor is a combined MAF sensor and IAT sensor.

DTC P0112
Intake-air temperature sensor fault (in MAFS) Drive cycle B:Signal out of range - below minimum.

Possible causes by suggested order of priority:
- Open circuit - C636/34 (SL) to C149/1 (SLG).
- Open circuit - C636/9 (RB) to C149/3 (RB).
- 5V IATS supply voltage C149/4 (R) to C636/7 (R).
- 12V IATS supply voltage C149/2 (NK) to C149/3 (RB).
- Connectors C149, ECM C636 (B).
- Fuse F2 Engine Compartment Fusebox.
- Inlet air temperature sensor faulty.

Open circuit - C636/34 (SL) to C149/1 (SLG).
- Check resistance > 1M Ohm

Open circuit - C636/9 (RB) to C149/3 (RB).
- Check resistance > 1M Ohm

5V IATS supply voltage C149/4 (R) to C636/7 (R).
- 5V IATS supply voltage C149/4 (R) to C636/7 (R).
Between 4.5V and 5.5V.
- If the voltage is too high a short circuit to battery or faulty ECM should be suspected.
- If the voltage is too low an open circuit or connector problem should be suspected.

12V IATS supply voltage C149/2 (NK) to C149/3 (RB).
- 12V IATS supply voltage C149/2 (NK) to C149/3 (RB).
Between 11.5V and 15.0V.
- If the voltage is not present check F2 Engine Compartment Fusebox and open circuit C149/2 (NK) to C570/5 (NK).

Connectors C149, ECM C636 (B).
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

Fuse F2 Engine Compartment Fusebox.
- Check for fuse not correctly inserted, fuse blown, fuse connections loose, damaged or corroded.
- Certain diagnostics may also perform further checks to try and narrow down the fault. Eg Check if other circuits fed by the same fuse are also experiencing problems

Inlet air temperature sensor faulty.
- Check inlet air temperature sensor (in MAFS) by substituting MAFS with known good unit.
- IATS/MAFS Fault.