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Home >> Mazda >> 1987 >> B2000 Base, 2D Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Idle-Up System >> Component Testing >> Servo Diaphragm
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Servo Diaphragm

  1. Ensure all accessories are off and connect a tachometer. Bring engine to normal operating temperature and run at idle. Disconnect vacuum hose at servo diaphragm.
  2. Disconnect intake manifold vacuum hose at 3-way solenoid valve and connect to servo diaphragm. Increase engine speed to 2000 RPM and release it. Engine RPM should be 1300-1500 RPM. If RPM is not within specifications, adjust by turning servo diaphragm adjusting screw.
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