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HOMESERVICE MANUALSCHEVROLET2006RV CUTAWAY 6.6 2REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - 6.6L (LLY) - DTC P0016 TO DTC P0342DTC P003ACIRCUIT/SYSTEM TESTING
2006 Chevrolet RV Cutaway 6.6 2

Circuit/System Testing

2006 Chevrolet RV Cutaway 6.6 2SECTION Circuit/System Testing
IMPORTANT: The DMM and test leads must be calibrated to 0 ohms in order to prevent misdiagnosis. Use the DMM to perform this test. Refer to the DMM User Manual for calibration procedure.
  1. With the ignition ON and engine OFF, disconnect the turbocharger vane position control solenoid. Measure for a voltage of less than 1 volt at the solenoid low reference circuit with a DMM connected to a good ground.
    • If the voltage is greater than 4.8 volts, repair the short to voltage.
    • If the circuit tests normal, replace the ECM.
  2. With the ECM and the turbocharger solenoid disconnected, measure for a resistance of less than 3 ohms on the high voltage control and the low reference circuits.
    • If the resistance is over 3 ohms, repair the high resistance or poor connection in the faulty circuit.
    • If the resistance is less than 3 ohms, test the turbocharger solenoid. Refer to Component Testing in this diagnostic.
  3. With the ECM and the turbocharger vane position sensor disconnected, measure for a resistance of less than 10 ohms on each of the three vane position sensor circuits.
    • If the resistance is more than 10 ohms, repair the high resistance or poor connection on the faulty circuit.
  4. Remove the solenoid from the turbocharger. Connect the ECM and the turbocharger solenoid connectors. With the ignition ON and the engine OFF, depress the button at the tip of solenoid slightly. Command the TC Vane Pos. Ctrl. solenoid valve ON with a scan tool while observing for the spool valve to open at the slot closest to the button.
    • If the spool valve did not operate, replace the solenoid.
  5. With the ignition OFF, remove the turbocharger vane position sensor. With the ignition ON, slowly depress the button on the end of the TC sensor. Observe the TC vane position sensor parameter for a smooth decreasing percentage from 100-0 percent.
    • If the parameter does not increment smoothly, replace the turbocharger vane position sensor.
  6. Inspect the turbocharger for debris, damage, or stuck. Refer to Turbocharger Cleaning and Inspection .
    • If all circuits, the TC solenoid, the TC vane position sensor, and the turbocharger tests OK, 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.