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Infiniti > Engine Codes > P0403


Models:	Most Infiniti Models

DTC: P0403

Search Bulletins/Recalls for P0403

Trouble diagnosis name: EGR volume control valve circuit

Component Description

The EGR volume control valve uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECM. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECM does not issue the pulse signal. A certain voltage signal is issued so that the valve remains at that particular opening.

DTC detecting condition:

An improper voltage signal is sent to ECM through the valve

Possible cause:

Harness or connectors (EGR volume control valve circuit is open or shorted.)
EGR volume control valve

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