Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Air Injection System

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OPERATION



See Figures 1, 2, 3 and 4

This system is used on the 22R and 3F-E engines only.

Some unburned HC and CO remains in the exhaust flow after it leaves the cylinder. To encourage further burning in the exhaust port, compressed air from the air pump is blown into the exhaust port. This generally takes place during low and medium speed driving or during high speed deceleration. The engine control computer uses input signals from the rpm, the coolant temperature sensor and the engine vacuum sensor to control the function of the Vacuum Solenoid Valve (VSV). The VSV acts as a gatekeeper for the system, turning it on and off by controlling vacuum. Within the system, further control is maintained by both the Air Bypass and Air Switching Valves (ABV/ASV).



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Fig. Fig. 1: Air injection system components-22R engine



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Fig. Fig. 2: Air injection system schematic-22R engine



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Fig. Fig. 3: Air injection system components-3F-E engine



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Fig. Fig. 4: Air injection system schematic-3F-E engine

TESTING



Air Pump

Do not ham