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Home › Mazda › 2021 › CX-9 Signature › Repair and Diagnosis › Engine Performance › System › On-Board Diagnostic - Engine Control System (3 Of 6) › DTC P0421-00: Catalytic Converter System › Repeatability Verification Procedure

Repeatability Verification Procedure

  1. Start the engine and leave it idling for 1 min.
  2. Drive the vehicle normally for 1 5 min. After that, shift to 3rd gear and maintain the vehicle speed at approx. 40 km/h {25 mph}.
  3. Accelerate the vehicle to 60 km/h {37 mph}while in 3rd gear.
  4. Release the accelerator pedal and decelerate the vehicle to 40 km/h {25 mph}.
  5. Accelerate the vehicle to 60 km/h {37 mph}again while in 3rd gear.
  6. Drive the vehicle for 20 sat a speed of 50 km/h {31 mph}while in 3rd gear.
  7. Repeat Step  4 to  6 operations above 20 times.
    NOTE:
    • Match the engine coolant temperature in the recorded FREEZE FRAME DATA/snapshot data, the vehicle speed, and engine speed values to the best extent possible while driving the vehicle.
  8. Try to reproduce the malfunction by driving the vehicle for 5 min based on the values in the FREEZE FRAME DATA/snapshot data.
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