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Home › Pontiac › 2006 › Solstice Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - 2.4L - DTC P0010 To DTC P0340 › DTC P0117 or P0118 › Circuit/System Testing

Circuit/System Testing

DTC P0117

  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the ECT sensor.
  3. Observe the ECT Sensor parameter with a scan tool.
    • If the ECT Sensor parameter is less than -39°C (-38°F), then replace the ECT sensor.
    • If the ECT Sensor parameter is more than 149°C (300°F), then test the ECT sensor signal circuit for a short to ground.
    • If the ECT sensor signal circuit tests normal, then replace the ECM.

DTC P0118

  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the ECT sensor.
  3. Measure for the proper range of 4.9-5.2 volts between the ECT sensor signal circuit and a good ground with a DMM.
    • If the voltage is less than 4.9 volts, test the ECT sensor signal circuit for a high resistance or an open circuit.
    • If the voltage is more than 5.2 volts, test the ECT sensor signal circuit for a short to voltage.
    • If the ECT 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 all of the control modules to power down before taking a resistance measurement.
  5. Measure for a proper value of less than 5 ohms of resistance between the ECT 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 ECM.
  6. Turn ON the ignition, with the engine OFF.
  7. Observe the ECT Sensor parameter while connecting and disconnecting a 3-amp fused jumper wire between the ECT sensor signal and low reference circuits. This should cause the ECT Sensor parameter to toggle between the upper and lower temperature limits.
    • If the ECT Sensor parameter does not toggle, replace the ECM.
    • If the ECT Sensor parameter does toggle, then test the ECT sensor signal circuit for a short to another 5-volt reference circuit.
    • If the ECT sensor signal circuit is not shorted to another 5-volt reference circuit, then replace the ECT sensor.
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