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Home >> Chevrolet >> 2007 >> Impala LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0420 To DTC P3433 >> DTC P3400 >> Circuit/System Verification
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Circuit/System Verification

  1. Start and idle the engine.
  2. Allow the engine to reach normal engine operating temperature. The engine should idle smoothly, without any misfires. If the engine misfires, refer to DTC P0300 .
  3. Monitor the cylinder deactivation system data parameters with a scan tool.
  4. Road test the vehicle under light throttle and load conditions that will allow the ECM to command V3 mode. If all enabling conditions are met for cylinder deactivation, and if no internal engine hydraulic/mechanical fault conditions are present, the ECM will continue with V3 mode operation.
    • If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
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