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EGR CONTROL OUTLINE [LF]
• Adjusts the EGR valve to the optimum opening angle according to engine operation conditions.
• The valve in the EGR valve allows for more precise control by being driven by the stepping motor.
End Of Sie
EGR CONTROL BLOCK DIAGRAM [LF]
MAF SENSOR
IAT SENSOR
TP SENSOR NO.1, NO.2
ECT SENSOR
CKP SENSOR
MAP SENSOR
BARO SENSOR
NEUTRAL SWITCH (MT)
CPP SWITCH (MT)
BATTERY
VEHICLE SPEED SIGNAL
TR SWITCH (AT)
End Of Sie
EGR CONTROL OPERATION [LF]
Stepping Motor Operation Principles
• The PCM opens/closes the EGR valve by controlling the amount of stepping motor rotation (step number).
• The stepping motor operates by the combination of coils No.1—4, according to the stepping motor step
number.
Energization condition for each coil
When current step number divided
by eight
Coil No.1
Coil No.2
Coil No.3
Coil No.4
Example of energization condition for each coil and step number
Step number
0
Coil No.1
ON
Coil No.2
OFF
Coil No.3
OFF
Coil No.4
ON
• The energization condition of stepping motor coils No.1—4 can be verified by verifying the step number from
"SEGRP" on the PID/data monitor function of the WDS.
01–40–30
CONTROL SYSTEM
EGR VALVE OPERATION
STEP NUMBER
TARGET EGR
VALVE
POSITION
BASIC EGR VALVE
POSITION
CORRECTIONS
0
1
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
1
2
3
4
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
PCM
CURRENT
EGR VALVE
POSITION
ON: Energization, OFF: Non-energization
2
3
4
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
ON: Energization, OFF Non-energization
5
6
7
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
E5U014000000N34
E5U014000000N35
EGR VALVE
E5U140ZT5006
E5U014000000N36
5
6
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
8
9
10
30
ON
ON
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
ON
7
OFF
OFF
OFF
ON
52
OFF
ON
ON
OFF
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