Abnormal Pressure

Whenever system's high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker above the gauge scale in the following tables indicates the standard (normal) pressure range. Since the standard (normal) pressure, however, differs from vehicle to vehicle ("Ambient air
temperature-to-operating pressure table"). Performance Test Conditions




Both High and Low-pressure Sides are Too High.




High-pressure Side Is Too High And Low-pressure Side Is Too Low.




High-pressure Side Is Too Low And Low-pressure Side Is Too High.




Both High And Low-pressure Sides Are Too Low.




Low Pressure Side Sometimes Becomes Negative




Low Pressure Side Becomes Negative