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HOMESERVICE MANUALSCHEVROLET2006RV CUTAWAY 6.6 2REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - 6.6L (LLY) - DTC P0016 TO DTC P0342DTC P0128CIRCUIT/SYSTEM TESTING
2006 Chevrolet RV Cutaway 6.6 2

Circuit/System Testing

2006 Chevrolet RV Cutaway 6.6 2SECTION Circuit/System Testing
  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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.