Doosan Excavator P0408 Maximum EGR Rate Governor Deviation Error Solution

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This instruction show you guide on how to solve Doosan excavator P0408 maximum EGR rate governor deviation error.

Preparations:

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Doosan uVIM Diagnostic Tool

1 Overview

“E” SPN FMI:E00323616

REASON:

1 Air path problem (EGR cooler plugged, Tampering by user)

2 Air path problem (EGR path leakage, Intake air path leakage)

3 Electrical problem (Faulty Air mass flow sensor, Faulty Intake manifold pressure sensor)

EFFECT:

CE lamp ON Torque Reduction 1(Mild) Inducement Group1 (EGR Block) – with EGR

Only DPF regeneration inhibit by Active and Forced

2 Component Location

3) Condition for Running Diagnostic

During engine running, Coolant temperature > 60 degC

4) Condition for Setting the Fault Code

The limit for the maximum permissible positive closed−loop EGR rate control deviation of the

exhaust gas recirculation control has been exceeded.over than 60sec.

5) Condition for Clearing the Fault Code

The limit for the maximum permissible positive closed−loop EGR rate control deviation of the

exhaust gas recirculation control has been within operation range.

The fault is healed only after key off & on condition.

6 Check List

6)  Check List

Step	Inspection	Standard Value	YES	NO
1	P0408 is detected on service tool?		Step2
2	Let the machine be in safety area, and key OFF.		Step3
3	Check the  EGR  pipe  between  exhaust  manifold and EGR valve? Is there any leakage? Or blocked line ? If no leakage is found visually, Start up the engine and check the leakage/blocked again in machine stationary condition.		Step7	Step4
4	Check EGR pipe between EGR cooler and intake manifold. Is there any leakage? Or Blocked line ? If no leakage is found visually, Start up the engine and check the leakage/blocked again in machine stationary condition.		Step7	Step5
5	Check intake air path between Air filter and intake manifold. Is there any leakage? If no leakage is found visually, Start up the engine and check the leakage again in machine stationary condition.		Step7	Step6
6	Is  there  any  fault  code  related  intake  manifold pressure   sensor,   intake   manifold   temperature sensor? If yes, fix the fault  based  on  its troubleshooting guide.		Fix the fault based on its troubleshooti ng guide	Step8
7	Fix the leakage/blocked line or change the pipe. After fix, start the engine and change the RPM from low idle to high idle. Keep the RPM as high idle at least 60 seconds. Fault code is cleared?		Problem solved	Step8
8	Is there abnormal value of intake manifold pressure sensor or air mass flow sensor? (ex. Service tool value is not increase even engine speed increase) *Variables 1) Engine speed(Epm_nEng) 2) Intake manifold pressure (Air_pIntkVUs) 3) Air mass flow (AFS_dmSens) 4) Model air mass flow (AirMod_mfGasIntkVlv_f)		Step 9	Contact Helpdesk
9	Change the suspected parts, start the engine and change the RPM from low idle to high idle. Keep the RPM as high idle at least 30 seconds. Fault code is cleared?		Problem solved	Contact Helpdesk

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