Auxiliary Air Control (AAC) Valve
To test system, see AUXILIARY AIR CONTROL (AAC) diagnostic chart.
To test AAC valve, check resistance between terminals No. 1 and 2; 2 and 3; 4 and 5; and 5 and 6 of AAC valve connector. Refer to Fig 1 . If resistance is not 27-40 ohms at 68°F (20°C), replace AAC valve.