Air Injection System: Operation: XJ6

A thermal switch supplies current to the switching module when engine coolant is below 104-122° F (40-50° C). The module controls 3 items. It stops canister purging, blocks oxygen sensor feedback operation, and controls air switching valve to supply air to exhaust ports.

When engine coolant is above the thermal switch temperature, contacts open and no power is supplied to switching module. Air injection stops; canister purge and oxygen sensor operation begin.

The air switching valve is located at the rear of the air pump. A solenoid in the valve controls vacuum which positions the valve to allow air injection or by-pass to the air cleaner.