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Home >> Cadillac >> 2006 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.6L - DTC P0016 To P0401 >> DTC P0128 >> Circuit/System Testing
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Circuit/System Testing

  1. 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.
  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, then 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 sensor signal circuit.
  6. Remove and test the ECT sensor. Observer the component testing procedure below.
    • 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, then replace the ECM.
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