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Home >> Acura >> 2012 >> ZDX >> Repair and Diagnosis >> Engine Performance >> System >> Advanced Diagnostics >> DTC P0401: Exhaust Gas Recirculation (EGR) Insufficient Flow >> Malfunction Threshold
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Malfunction Threshold

The ratio of the current EGR flow to the normal EGR flow is 15 % or less for at least 3.0 seconds.

The ratio is derive from the actual and estimated MAP values that are each difference between before and after the EGR valve was opened.

The estimation MAP difference value is applied in the table.

MALFUNCTION THRESHOLD CONDITIONS

Engine speed Barometric pressure
52 kPa (15.4 inHg, 390 mmHg) 101 kPa (29.9 inHg, 760 mmHg)
1,200 rpm 7 kPa (2.2 inHg, 55 mmHg) 12 kPa (3.4 inHg, 87 mmHg)
2,100 rpm 4 kPa (1.3 inHg, 33 mmHg) 7 kPa (2.0 inHg, 50 mmHg)