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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 147 (Engine Control System - 3.8L - DTC P0016 To DTC P0206) >> DTC P0112, P0113, P1111 or P1112 >> Circuit/System Testing >> P0112 or P1112

P0112 or P1112

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Observe the IAT sensor with a scan tool for 130°C (266°F).
  2. Disconnect the MAF/IAT sensor. Observe the IAT sensor with a scan tool for -36°C (-33°F).
    • If more than specified temperature, then 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. Test for an intermittent and for a poor connection at the control module. If all circuits test OK then replace the control module.
    • If less than specified temperature, then test for an intermittent and for a poor connection at the IAT sensor. If circuit tests OK then replace the MAF/IAT sensor.
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