EGR Valve: Description and Operation

Fig. 82 Air Injection And EGR System Diagram:

A single stage EGR valve is bolted to the exhaust manifold for cylinders 4- 6. The CIS - E control module controls the introduction of exhaust gases via the switchover valve. Exhaust gases are introduced when the coolant temperature is greater than 60° C (140° F), the air flow sensor potentiometer voltage is greater than 2 volts, and the full load and idle speed contacts are open.