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Tercel Sedan

  1. Disconnect vacuum hose at Integrated Ignition Assembly (IIA) sub-diaphragm. See Figure- Figure . Connect a vacuum gauge to sub-diaphragm. Ensure coolant temperature is below 77°F (25°C). Start engine and note vacuum reading while increasing and decreasing engine RPM.
  2. Vacuum reading should remain steady. Operate engine until coolant temperature exceeds 106°F (41°C). Operate engine and note vacuum reading while increasing and decreasing engine RPM.
  3. Reading should vary with manifold vacuum. Remove vacuum gauge and reinstall vacuum hose.
  4. On M/T models, disconnect main diaphragm (outer) hose at IIA and connect to vacuum gauge. With coolant temperature below 104°F (40°C), start engine.
  5. Note that vacuum gauge indicates no vacuum. Warm engine to 129°F (54°C). Accelerate engine to 2500 RPM and note that vacuum is indicated. Remove vacuum gauge and reinstall vacuum hose.
  6. On all models, remove IIA cap, rotor and dust cover. Apply vacuum to both diaphragms and note that advancer moves. Repair as necessary if no movement exists. If system operation was incorrect, individual components must be tested. See COMPONENT TESTING .
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