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Home >> Mazda >> 1980 >> B2000 Base >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Deceleration Control System >> Testing & Adjustment >> Throttle Positioner System >> Servo Diaphragm
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Servo Diaphragm

  1. Connect tachometer to engine. Start and warm engine to normal operating temperature. Stop engine. Remove air cleaner.
  2. Detach intake manifold vacuum hose from 3-way solenoid and detach 3-way solenoid vacuum hose from servo diaphragm. Connect intake manifold vacuum hose directly to servo diaphragm.
  3. On Calif. GLC with Auto. Trans., detach and plug distributor-to-carburetor vacuum tube at distributor.
  4. On all models, start engine, run to high speed then decrease to idle. With servo diaphragm hooked directly to intake manifold, engine should idle at RPM shown in "Throttle Positioner System Operating RPM" table. If vehicle is equipped with air conditioning, it will idle at approximately 1200 RPM.
  5. If speed is not to specifications, turn throttle positioner adjusting screw located on linkage near end of servo diaphragm link on carburetor. If setting cannot be obtained, replace servo diaphragm.
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