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Home >> Toyota >> 1985 >> Tercel Base >> Repair and Diagnosis >> Engine Performance >> System >> Throttle Positioner System >> Component Testing >> Throttle Positioner (TP)
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Throttle Positioner (TP)

  1. Warm up engine and check idling speed. Check throttle positioner setting speed. To adjust speed disconnect vacuum hose from throttle positioner diaphragm and plug hose end.
  2. Throttle positioner setting speed is 1400 RPM. If not at specified speed, adjust with throttle positioner screw.
  3. Check operation of VTV. Reconnect vacuum hose to TP diaphragm, and check that engine returns to idle speed within 2-6 seconds.
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