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Home >> Chevrolet >> 2006 >> Impala SS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 5.3L - Troubleshooting & Diagnosis >> Displacement on Demand (DoD) System Diagnosis >> Circuit/System Testing

Circuit/System Testing

  1. Connect a vacuum gage to the evaporative emission (EVAP) vacuum tube fitting on the intake manifold. Do not use a compound pressure and vacuum gage. The vacuum gage on a hand held vacuum pump or Mityvac will work fine for this test.
  2. Allow the engine to reach normal operating temperature.
  3. With a scan tool, command each DoD solenoid ON, one at a time. Each time a DoD solenoid is commanded ON, you should observe a fluctuating drop of 0.5-2 inches of Hg or vacuum on the gage. The drop in vacuum occurs because both the intake and exhaust valves are deactivated for that cylinder. Also, the engine will have a misfire when that cylinder is deactivated. For additional DoD mechanical testing, refer to Displacement on Demand (DoD) System Diagnosis .
  4. Clear any DTCs with a scan tool.
  5. With a scan tool, monitor the following parameters in the Cylinder Deactivation Data menu:
    • The Cylinder Deactivation System command
    • The Cylinder #1, 4, 6, and 7 Deactivation Solenoid command
    • The Cylinder Deactivation Performance test
  6. Road test the vehicle at 40 mph, under a light load condition with a steady throttle input that will allow V4 mode. The scan tool should display V4 mode for the Cylinder Deactivation System command, ON for each Cylinder Deactivation Solenoid command, and OK for the Cylinder Deactivation Performance test.
    • If the engine does not switch to V4 mode, then review the DoD inhibit fault listing at the end of the Cylinder Deactivation Data menu, or refer to Displacement on Demand (DoD) System Description for inhibit reasons.
    • If the engine does switch to V4 mode, review the DoD driving information in the Features and Controls section of the owner's manual with the vehicle operator, or instruct the vehicle operator in the proper driving techniques to obtain V4 mode.
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