EGR VALVE [SKYACTIV-G 2.5T]

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Purpose, Function

•  The EGR valve adjusts the amount of exhaust gas passing through the EGR cooler to be recirculated to the intake manifold.
•  The EGR valve opens/closes the valve according to the control signal from the PCM.

Construction

•  The EGR valve is located on the EGR cooler.
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•  Two-phase stepping motor has been adopted for the EGR valve.
•  The EGR valve consists of the coils, stator, rotor, spring, rod, and valve.
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Operation

•  The EGR valve opens/closes by driving the stepping motor of the EGR valve according to the control signal from the PCM.
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•  The stepping motor operates by the combination of coils No.1 to 4 according to the stepping motor step number (maximum step number: 68), and drives the shaft.

Example of energization condition for each coil and step number

ON: Energization, OFF: Non-energization

Step number

0

1

2

3

4

5

6

7

8

9

10

30

68
Coil No.1
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
Coil No.2
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
Coil No.3
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
Coil No.4
ON
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
ON
OFF


Coil energization and motor operation conceptualization.

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•  Exhaust gas is recirculated to the intake manifold side by driving the shaft to open the valve.


EGR valve open/closed view

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•  For EGR control details, refer to CONTROL SYSTEM. (See EGR CONTROL [SKYACTIV-G 2.5T].)


Fail-safe

DTC

Fail-safe
P0403:00
•  Inhibits the EGR control.