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Home >> Mazda >> 1981 >> GLC Custom, 4D Hatchback, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Air Injection >> Testing >> Check Valve
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Check Valve

NOTE: All models except B2000 are equipped with 2 check valves. Testing procedure applies to both types of check valves.
  1. Warm engine until normal operating temperature is reached. Stop engine and disconnect air hose from check valve connector.
  2. Slowly increase engine speed to 1500 RPM while holding hand over open connection. Check for exhaust leak from check valve. If exhaust gas escapes, replace check valve.
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