Mazda 2006 MX-5 - Egr Control Operation [Lf]; Stepping Motor Operation Principles

CONTROL SYSTEM
01–40–30
EGR CONTROL OUTLINE [LF]
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• 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.
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EGR CONTROL BLOCK DIAGRAM [LF]
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EGR CONTROL OPERATION [LF]
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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
ON: Energization, OFF: Non-energization
Example of energization condition for each coil and step number
ON: Energization, OFF Non-energization
• 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.
MAF SENSOR
IAT SENSOR
ECT SENSOR
PCM
CKP SENSOR
NEUTRAL SWITCH (MT)
CPP SWITCH (MT)
BATTERY
VEHICLE SPEED SIGNAL
EGR VALVE OPERATION
STEP NUMBER
TARGET EGR
VALVE
POSITION
CURRENT
EGR VALVE
POSITION
BASIC EGR VALVE
POSITION
CORRECTIONS
EGR VALVE
TR SWITCH (AT)
TP SENSOR NO.1, NO.2
MAP SENSOR
BARO SENSOR
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When current step number divided
by eight
01234567
Coil No.1 ON ON ON OFF OFF OFF OFF OFF
Coil No.2 OFF OFF OFF OFF ON ON ON OFF
Coil No.3 OFF OFF ON ON ON OFF OFF OFF
Coil No.4 ON OFF OFF OFF OFF OFF ON ON
Step number 0123456789103052
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