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Home >> Toyota >> 1978 >> Land Cruiser 4D Utility >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Throttle Positioner System >> Testing >> Throttle Positioner System >> 1975 Models

1975 Models

  1. Visually inspect all hose and wiring. With engine idling, disconnect throttle positioner vacuum hose. Accelerate engine and quickly release throttle. Engine should idle faster than normal idle speed.
  2. Connect throttle positioner vacuum hose to intake manifold vacuum. Engine should return to normal idle speed. If not, check throttle positioner diaphragm and linkage.
  3. Using "T" fitting, connect vacuum gauge in throttle positioner vacuum hose and position gauge so it may be seen while driving vehicle. Road test vehicle. Throttle opener system should come on/off at specified speeds. See THROTTLE POSITIONER OPERATING RANGE table . If not, check vacuum switching valve and speed sensor.
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