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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1863 (Engine Controls And Fuel - 2.4L (Lat) - DTC P0420 To DTC P2544) >> DTC P0420 >> Repair Verification

Repair Verification

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear the DTCs.
  2. Allow the engine coolant temperature to reach 70°C (156°F).
    • Place the gear selector in Park (Neutral for manual).
    • Set the parking brake.
  3. Press and hold the service brake.
  4. Run the engine for 6 minutes at 2,500 RPM.
  5. Allow engine speed to return to idle speed, then place gear selector into Drive, or apply clutch pedal for manual.
  6. After 2 minutes verify that DTC P0420 has passed or failed this ignition cycle.
    • If not passed or failed this ignition cycle, the test aborted resulting in an inconclusive test result. The above test may need to be repeated up to 5 more times during this drive cycle. The first test should be run after the initial warm up period of 6 minutes. Between subsequent tests maintain 2,500 RPM for 2 minutes.
  7. If 6 tests have been attempted and the DTC has not run or passed during this key cycle, turn the key to OFF for 30 seconds, then run the procedure a second time.
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