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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0016-P0401)) >> DTC P0128 >> Circuit/System Testing

Circuit/System Testing

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  1. Turn OFF the ignition and all electrical accessories. Allow sufficient time for the control module to power down before taking a resistance measurement.
  2. Disconnect the ECT sensor.
  3. 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.
    • If the ECT low reference circuit tests normal, replace the ECM.
  4. Disconnect the ECM.
  5. Measure for a proper value of less than 5 ohms of resistance on the ECT sensor signal circuit.
    • If the resistance is more than 5 ohms, repair the high resistance in the ECT signal circuit.
  6. Remove and test the ECT sensor.
    • If the resistance measurements of the ECT sensor are out of range, replace the sensor.
    • If the ECT sensor tests normal and the DTC continues to set, replace the ECM.
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