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Home >> Pontiac >> 2006 >> G6 Base, 2.4 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 2.4L - DTC P0010 To DTC P0341 >> DTC P0112 or P0113 >> Circuit/System Testing >> DTC P0113
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DTC P0113

  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 more than 5.2 volts, test the IAT sensor signal circuit for a short to voltage.
    • 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 IAT sensor signal circuit tests normal and the voltage is still not within the proper range, then replace the ECM.
  4. Turn OFF the ignition and all electrical accessories. Allow sufficient time for the control module to power down before taking a resistance measurement.
  5. Measure for a proper value of 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 or an open circuit.
    • If the IAT low reference circuit tests normal, then replace the ECM.
  6. Turn ON the ignition, with the engine OFF.
  7. Observe the IAT Sensor parameter while connecting and disconnecting a 3-amp fused jumper wire between the IAT sensor signal and low reference circuits. This should cause the IAT Sensor parameter to toggle between the upper and lower temperature limits.
    • If the IAT Sensor parameter does not toggle, replace the ECM.
    • If the IAT Sensor parameter does toggle, then test the IAT sensor signal circuit for a short to another 5-volt reference circuit.
    • If the IAT sensor signal circuit is not shorted to another 5-volt reference circuit, then replace the IAT sensor.
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