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Home >> Acura >> 2009 >> TL Base >> Repair and Diagnosis >> Engine Performance >> System >> Advanced Diagnostics >> DTC P0401: Exhaust Gas Recirculation (EGR) Insufficient Flow >> Driving Pattern

Driving Pattern

Fig 1: Vehicle Speed Driving Pattern
G06123601Courtesy of AMERICAN HONDA MOTOR CO., INC.
  1. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on.
  2. Drive the vehicle at a speed between 15 - 75 mph (24 - 120 km/h) for at least 5 seconds.
  3. Then, drive at a steady speed between 55 - 75 mph (88 - 120 km/h) for at least 10 seconds.
  4. Decelerate with the throttle valve fully closed for at least 4 seconds.
    • Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.