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Home >> Chevrolet >> 2011 >> Volt >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L (LUU) - DTC P0335 Through DTC P1255/P064A >> DTC P0420 >> Circuit/System Verification

Circuit/System Verification

  1. Service Mode active, observe the DTC information with a scan tool. Verify there are no other DTCs set.
  2. Ignition ON, engine running, operate the vehicle within the Conditions for Running the DTC. Observe the scan tool Catalyst Monitor Not At Idle Test Conditions Met parameter. The parameter will change to Yes when the Conditions have been met.
    • If not the specified value, operate the vehicle within the Conditions for Running the DTC.
  3. Monitor the scan tool Catalyst Monitor Test State parameter. When the parameter indicates Active, the Catalyst Monitor Test is running.
  4. Continue to monitor the parameter. When the parameter indicates Inactive, the Catalyst Monitor Test has completed.
  5. When the test has completed, the Catalyst Monitor Test Counter parameter will increment by one and the Catalyst Monitor Test Result parameter will indicate Pass, Fail, or No Decision.
    • If no decision has been made, repeat steps 2-4 until the Test Result parameter indicates Pass or Fail.
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