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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Engine Controls - 3.9L - DTC P0011 To P0420) >> DTC P0112 or P0113 >> Circuit/System Testing >> P0112

Circuit/System Testing: P0112

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the mass air flow (MAF)/IAT sensor. Observe the intake air temperature (IAT) sensor with a scan tool for -36°C (-33°F).
    • If more than -36°C (-33°F), test the signal circuit of the IAT sensor for a short to ground or a short to the IAT low reference circuit and repair as necessary. If all circuits test OK then replace the control module.
    • If less than -36°C (-33°F), replace the MAF/IAT sensor.
    • If IAT signal circuit tests OK, then replace the control module.
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