Exhaust Gas Recirculation (EGR) System Monitor (P0400)

Test conditions/procedure

1. All of the following conditions should be satisfied when the drive test is carried out.
   1. Engine coolant temperature: 80°C (176°F) or higher (when engine is fully warmed up)
   2. Outside air temperature: 5°C (41°F) or higher
   3. A/T condition:
      • Selector lever position: D range
      • Overdrive switch: ON
      • Power/economy changeover switch: Power
   4. A/C switch: OFF
2. Carry out one trip monitoring according to the following drive pattern (from starting of the engine until ignition is turned off). (Takes approximately 10 minutes.)
   1. After the engine is fully warmed up, turn the ignition switch to OFF.
   2. Start the engine and accelerate to a speed of between 56 - 64 km/h (35 - 40 mph).
   3. Monitoring period: with the engine speed at between 2,000 - 3,000 r/min and the clutch still engaged , fully close the throttle and let the vehicle decelerate to an engine speed of 900 r/min without applying the brakes. The steering wheel should not be turned and no lights or accessories should be turned on or off during this time.
   4. Accelerate to between 56 - 64 km/h (35 - 40 mph) and drive at this speed for 20 seconds or more. [After the first monitoring (deceleration), an interval of 20 seconds or more is necessary before the next monitoring (deceleration) is made.] Repeat steps 3 and 4 a total of 8 times.
   5. Decelerate to a stop. After the vehicle has stopped, turn the ignition switch to OFF.