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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0016-P0401)) >> DTC P0117 or P0118 >> Circuit/System Testing

Circuit/System Testing

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P0117

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

P0118

  1. Disconnect the ECT sensor.
  2. Turn the ignition ON with the engine OFF.
  3. Measure the voltage between the ECT signal circuit and a good ground with a DMM.
    • If the voltage is more than 5 volts, test the ECT signal circuit for a short to voltage.
    • If the voltage is less than 4.9 volts, test the ECT signal circuit for an open or a faulty ECM.
  4. Measure the voltage between the ECT low reference circuit and the ECT signal circuit.
    • If the voltage is more than 5 volts, test the ECT low reference circuit for a short to voltage or a faulty ECM.
    • If the voltage is less than 4.9 volts, test the ECT low reference circuit for an open or a faulty ECM.
    • If the voltage is between 4.9-5 volts, test the ECT low reference circuit and the ECT signal circuit for high resistance.
  5. If the ECT sensor circuits test normal, replace the ECT sensor.
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