ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

Air Injection Reactor Systems

Print

OPERATION



See Figures 1, 2 and 3

In gasoline engines, it is difficult to burn the air-fuel mixture completely through combustion that takes place with the combustion chambers. In order to reduce HC and CO emissions, the system draws air into the exhaust ports to speed up oxidation. The air management valve switches air passage from the air pump through a vacuum management valve which is actuated by an electric signal supplied from the ECM.

The air pump is belt driven by the pulley mounted on the water pump shaft of the engine. Air is drawn through the air cleaner and suction hose into the outlet chamber, where it is trapped between two vanes and the pump body. As the rotor turns, these vanes carry the air to the outlet chamber and then to the air manifold.

TESTING



1.8L and 2.0L Engines

See Figures 4 and 5

The check valve should only allow air to flow in one direction. If air does not flow or in both directions, the valve is defective and must be replaced.

The air switching valve is designed to switch air flow from the air pump. When the manifold vacuum flows to the pipe, the air switching valve allows air from the pump to flow to the check valve. Unplug the valve electrical connector check the resistance between the terminals of the valve with an ohmmeter. It should be over 20 ohms.

2.3L and 2.6L Engines

See Figure 5

The check valve should only allow air to flow in one direction. If air does not flow or in both directions, the valve is defective and must be replaced.

Unplug the valve electrical connector check the resistance between the terminals of the valve with an ohmmeter. It should be over 20 ohms.

2.8L Engines

See Figure 6

Refer to the accompanying diagnostic chart.



Click image to see an enlarged view

Fig. Fig. 1: Air injection reactor system on 2.0L engines



Click image to see an enlarged view

Fig. Fig. 2: Air injection reactor system used on 2.6L engines



Click image to see an enlarged view

Fig. Fig. 3: Air injection management system found on 2.8L engines



Click image to see an enlarged view

Fig. Fig. 4: Air system switching valve operation



Click image to see an enlarged view

Fig. Fig. 5: Air system check valve



Click image to see an enlarged view

Fig. Fig. 6: Air management system diagnosis for 2.8L engines

 
label.common.footer.alt.autozoneLogo