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Home >> Subaru >> 1991 >> XT Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Throttle Position Sensor/Switch >> 6-Cylinder Throttle Position Sensor
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6-Cylinder Throttle Position Sensor

NOTE: All testing procedures are performed with engine at normal operating temperature.
  1. Disconnect TPS electrical connector. Insert a .014" (.35 mm) feeler gauge between throttle lever and throttle screw. Connect an ohmmeter between Black wire and Gray wire at TPS terminals. Maximum resistance should be 5000 ohms. Remove feeler gauge.
  2. Insert a .030" (.75 mm) feeler gauge between throttle lever and throttle screw. Ohmmeter should indicate infinity. Remove feeler gauge. Connect ohmmeter between Black/White wire and Black wire. Ohmmeter should indicate 3000-7000 ohms.
  3. Connect ohmmeter between Green/Black wire and Black wire. With throttle valve closed, ohmmeter should read 4200-15,000 ohms. Open throttle valve to wide open throttle position. Ohmmeter should indicate 100-11,000 ohms.
  4. Close throttle valve. With ohmmeter connected to Green/Black wire and Black wire, slowly open throttle. Ohmmeter reading should change smoothly as throttle goes from idle to wide open position.