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Home >> Mazda >> 1973 >> RX-2 Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Exhaust Emission Systems >> Testing >> Air Control Valve

Air Control Valve

With ignition turned off, check solenoid by connecting it directly to battery. If clicking sound is heard, solenoid is normal. Attach pressure gauge as shown in illustration and proceed as follows:

  1. Remove hoses from outlets "A" and "B" of air control valve and run engine at idle. Check to see that there are no air leaks from the outlets.
  2. Increase engine speed to 3500 RPM (Man. Trans.) or 3000 RPM (Auto. Trans.). Pressure gauge should now read 2.0-2.8 psi (.14-.20 kg/sq. cm) (Man. Trans.) or 2.0-2.6 psi (.14-.18 kg/sq. cm) (Auto. Trans.). There should be air coming from both outlets.
  3. Remove solenoid terminal. Pressure gauge should read.75 psi (.053 kg/sq. cm), and air should flow from outlet "A" but not from outlet "B" of air control valve. Remove pressure gauge and connect hoses.
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