Colt Vista 2WD L4-1997cc 2.0L SOHC (1985)
Fig. 9 Sub-EGR control valve
SUB-EGR CONTROL VALVE
The Sub-EGR Control Valve, Fig. 9, modulates EGR flow according to throttle opening. It is mechanically connected to the throttle linkage and opens
and closes with the motion of the throttle valve.
THERMO VALVE
The Thermo Valve controls the supply of vacuum available to the EGR Control Valve. It senses coolant temperature and closes the control valve when
temperatures are below the pre-set value of the valve, which results in improved cold engine driveability. When coolant temperature rises above the
pre-set temperature of the valve, the valve opens the control valve and permits exhaust gas recirculation to take place.
EGR CONTROL SOLENOID VALVE
When the solenoid valve is energized by the ECU, the EGR control valve is closed due to throttle ported pressure mixed with the turbocharger
pressure. When the solenoid valve is de-energized by the ECU, the EGR control valve is opened with the aid of throttle ported vacuum applied to its
diaphragm.
