Mazda 2006 MX-5 - Egr System Operation [Lf]; Egr System Outline [Lf]; Features; Egr System Structure [Lf]

EMISSION SYSTEM
01–16–4
EGR SYSTEM OUTLINE [LF]
E5U011600020N01
Features
• An EGR valve with a stepping motor has been adopted for optimum control according to engine operation
conditions.
• For control of EGR system, refer to CONTROL SYSTEM, EGR CONTROL. (See 01–40–30 EGR CONTROL
OUTLINE [LF], 01–40–30 EGR CONTROL BLOCK DIAGRAM [LF], 01–40–30 EGR CONTROL OPERATION
[LF].)
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EGR SYSTEM STRUCTURE [LF]
E5U011600020N02
• Consists of an EGR valve and EGR pipe to conduct exhaust gas to the intake air system.
System diagram
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EGR SYSTEM OPERATION [LF]
E5U011600020N03
• The high occurrence of NO
X
at high temperatures has been reduced by recirculating exhaust gas to the
combustion chamber in order to lower the combustion temperature.
• The exhaust gas flows along the EGR passage in the cylinder head and into the EGR valve. Exhaust gas that
has flowed past the EGR valve flows through the EGR pipe, and is conducted to the dynamic chamber.
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EGR VALVE FUNCTION [LF]
E5U011620300N01
• Adjusts the amount of exhaust gas to be recirculated from the exhaust system to the combustion chamber
based on the EGR control signal from the PCM.
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EGR VALVE CONSTRUCTION/OPERATION [LF]
E5U011620300N02
• Consists of a rotor, coils, and a spring.
• Operates based on the signal from the PCM to
drive the EGR valve stepping motor.
• The PCM determines the optimum EGR valve
opening angle based on the engine speed and
intake air amount when the engine is completely
warmed up and drives the EGR valve.
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EGR VALVE
: TO PCM
EGR PIPE
E5U116ZS5002
A
B
C
E
A
B
F
D
C
D
E
F
EGR VALVE
PCM
MAIN
RELAY
C3U0116S031