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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (On-Board Diagnostic - Engine Control (3 Of 5)) >> DTC P0421; Pcm Catalytic Converter System >> Repeatability Verification Procedure

Repeatability Verification Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine and leave it idling for 1 min.
  2. Drive the vehicle normally for 15 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 (Mode 2)/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 (Mode 2)/snapshot data.