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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 P0402-00: EGR Flow Excessive Detected >> Repeatability Verification Procedure
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Repeatability Verification Procedure

CAUTION:
  • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
  • While performing this step, always operate the vehicle in a safe and lawful manner.
  1. Start the engine and warm it up until the engine coolant temperature exceeds 80°C {176°F}.
  2. Start the engine, race it at 4, 000 rpm, and idle it.
  3. Repeat Step  2 operation above 2 times.