P0400

P0400

Exhaust Gas Recirculation Flow

Detection

After warming up engine and idling for 60 seconds, maintain engine speed at 2500 rpm for 40 seconds, drive vehicle and perform engine break deceleration by fully closing accelerator when engine speed is 2000 rpm or more

Condition

The target and actual positions of the No. 1 EGR valve assembly are different for 30 seconds or more (1 trip detection logic).

Trouble Area

  1. EGR valve stuck
  2. EGR valve does not move smoothly
  3. Open or short in EGR valve circuit
  4. EGR valve deposit
  5. EGR valve passage
  6. ECM
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