DTC Detection Logic

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0401

EGR A FLOW INSUFFICIENT

(EGR "A" flow insufficient detected)

Diagnosis condition

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Signal (terminal)

EGR volume control valve

Threshold

When ECM detects that negative pressure variation in intake manifold is smaller than the variation corresponding to EGR valve opening in case of opening/closing EGR control valve in a condition fuel supply is cut.

Diagnosis delay time

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