Component Location
General Description

Receiving ECM signal, linear solenoid type electronic EGR actuator operates EEGR valve directly.

ECM performs EGR system feed back control with the information of measured mass air flow (The role of AFS in diesel engine is different from gasoline engine. Fuel injection quantity is decided by AFS signal in gasoline engine.)

When EGR gas(contains no oxygen) flowing into combustion chamber increases, the air passing through AFS(contains oxygen) decreases. Thus, with the output signal change of AFS accompanied by EEGR actuator actuation, ECM determines the amount of recirculated EGR gas quantity.

caution

NOx is produced from the reaction of nitrogen and oxygen.

Controlling EGR gas(contains no oxygen) which is recirculated to combustion chamber, if least intake air required for complete combustion flows into combustion chamber, NOx decreases because there is no supplementary oxygen to react with nitrogen.

DTC Description

P0401 is set when EGR governer deviaton is below the lower limit value for more than 4 sec.. This code is due to open or short to ground in EEGR actuator circuit or internal open in EEGR component.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Signal monitoring

● EGR actuator circuit

● EGR actuator component

Enable Conditions

● Engine running

Threshold Value

● Short to GND, wiring open

Diagnostic Time

● 4 sec.

Fail Safe

Fuel Cut

NO

EGR Off

YES

Fuel Limit

NO

Check Lamp

YES

Specification

EGR actuator component resistance

EGR actuator operating Hz

EGR actuator operating duty

7.3~ 8.8Ω (30℃)

142Hz

Approx.10%(closed)~40%(opened)

Schematic Diagram
Signal Waveform
caution

The output of approx. 10% duty is mainly for the diagnosis of EEGR actuator circuit than actuating EEGR.

Яндекс.Метрика