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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 229 (Engine Controls - 3.5L - DTC P0016 To DTC P0206) >> DTC P0112, P0113, P1111 or P1112 >> Circuit/System Testing

Circuit/System Testing

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.

P0112 or P1112

  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.
IMPORTANT: The sensor may be damaged if the circuit is shorted to a voltage source.

P0113 or P1111

  1. Turn ON the ignition, with the engine OFF. Disconnect the MAF/IAT sensor. Connect a DMM between the signal circuit of the IAT sensor and a good ground. Measure for 5.2 volts.
    • If more than 5.2 volts, then test the signal circuit for a short to voltage.
  2. Connect a 3-amp fused jumper wire between the signal circuit of the IAT sensor and the low reference circuit of the IAT sensor. Observe the IAT sensor parameter with a scan tool for 130°C (266°F).
    • If more than 130°C (266°F), then test the IAT signal circuit for a short to any 5-volt reference circuit or for an intermittent and for a poor connection at the IAT sensor. If circuits test OK, then replace the MAF/IAT sensor.
  3. Connect a 3-amp fused jumper wire between the signal circuit of the IAT sensor and a good ground. Observe the IAT sensor parameter with a scan tool for 130°C (266°F).
    • If more than 130°C (266°F), then test the IAT sensor low reference circuit for high resistance or for an open. Test for an intermittent and for a poor connection at the control module. If circuits test OK, then replace the control module.
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