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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 1.8L (LUW, LWE) - DTC P0010 To DTC P0442) >> Diagnostic Information and Procedures >> DTC P0420: Catalyst System Low Efficiency >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON.
  2. Verify there are no other DTCs set.
    • If a DTC is not set 
  3. Operate the vehicle within the Conditions for Running the DTC.
  4. Verify the scan tool Catalyst Monitor Not At Idle Test Conditions Met parameter changes to Yes.
    • If Yes is not displayed 

      Refer to step  3.

    • If Yes is displayed 
  5. When the conditions are safe, stop and idle the vehicle in gear (If equipped with automatic transmission) or neutral (If equipped with manual transmission).
  6. Verify the Catalyst Monitor Test Result parameter displays Pass when performing the steps listed below:
    1. Apply the service brake.
    2. Monitor the scan tool Catalyst Monitor Test State parameter. When the parameter indicates Active, the Catalyst Monitor Test is running.
    3. Continue to monitor the parameter. When the parameter indicates Inactive, the Catalyst Monitor Test has completed.
      NOTE: When the test has completed, the Catalyst Monitor Test Counter parameter will increment by one and the Catalyst Monitor Test Result parameter will indicate Passed, Failed or No Result.
    • If the Catalyst Monitor Test Result parameter indicates No Result 

      Repeat steps  3- 6 until the Test Result parameter indicates Passed or Failed

    • If the Catalyst Monitor Test Result parameter indicates Failed 

      Refer to Circuit/System Testing 

    • If the Catalyst Monitor Test Result parameter indicates Pass 
  7. All OK.
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