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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 >> P0113

Circuit/System Testing: P0113

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.
    IMPORTANT: The sensor may be damaged if the circuit is shorted to a voltage source.
  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the IAT sensor.
  3. Measure for the proper range of 4.9-5.2 volts between the IAT sensor signal circuit and a good ground with a DMM.
    • If the voltage is less than 4.9 volts, test the IAT sensor signal circuit for a high resistance or an open circuit.
    • If the voltage is more than 5.2 volts, test the IAT sensor signal circuit for a short to voltage or any 5-volt reference.
    • If the IAT sensor signal circuit tests normal and the voltage is still not within the proper range, then replace the control module.
  4. Turn OFF the ignition and all electrical accessories. Allow sufficient time for all of the control modules to power down before taking a resistance measurement.
  5. Measure for less than 5 ohms of resistance between the IAT low reference circuit and a good ground.
    • If the resistance is more than 5 ohms, test the low reference circuit for a high resistance, an open circuit or a faulty control module.
    • If all circuits test OK, then replace the IAT sensor.
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