Exhaust Gas Recirculation (Egr) System; Component Descriptions - Mazda 626 MX-6 Workshop Manual

4A
EGR SYSTEM

EXHAUST GAS RECIRCULATION (EGR) SYSTEM

This system introduces exhaust gas into the intake manifold to reduce NOx in the exhaust gas. It oper­
ates depending on the engine load, engine speed (above 1,500 rpm), engine coolant temperature
(above 70°C, 158°F), and radiator coolant temperature (above 17°C, 63°F).

COMPONENT DESCRIPTIONS

Component
EGR control valve Recirculates portion of exhaust gas
Controls vacuum acting on EGR control
EGR modulator valve
valve
Detects signals from input sensors and
Engine control unit
switches; controls solenoid valve (EGR)
Ignition coil (-) Detects engine speed; sends signal to
control unit
terminal
Controls vacuum line to EGR control
Solenoid valve (EGR)
valve
Detects throttle valve opening angle;
Throttle sensor
sends signal to control unit
Detects coolant temperature;
Water thermo sensor
sends signal to control unit
Detects radiator coolant temperature;
Water thermo switch
sends signal to control unit
Function
Installed on throttle body
ON: above 17°C (63°F)
Application
New Previous
Remarks
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