Sub-Throttle Position (Sub-TP) Sensor: Adjustment

1. Disconnect sub-TP sensor connector. Loosen sub-TP sensor mounting screws. Remove sub-throttle actuator. Ensure sub-throttle valve is fully closed and sub-throttle valve gear is touching stop screw. Insert feeler gauge between gear and stop screw. See SUB-TP SENSOR ADJUSTMENT table.
2. Connect ohmmeter between terminals IDL2 and E2 of sub-TP sensor connector. See Figure. Rotate sub-TP sensor counterclockwise until there is no continuity, then rotate it clockwise until there is continuity. Tighten sub-TP sensor mounting screws. Inspect sub-TP sensor again.
   SUB-TP SENSOR ADJUSTMENT
   
   

   Application	Feeler Gauge Thickness
   LS400	.012" (.30 mm)

3. Warm engine. Ensure idle speed is 650-750 RPM. Remove cap, filter and separator from end of dashpot. See Fig 1. Start engine and raise engine speed to 4000 RPM. Use finger to cover hole inside area where separator is normally installed in dashpot. Release throttle valve. This will fully extend dashpot rod. Check engine speed (ensure cooling fan is not running).
4. If engine speed (dashpot set speed) is not 2500 RPM, rotate dashpot adjusting screw as necessary. When installing separator, filter and cap, install filter with coarse side facing away from dashpot.

Fig 1: Identifying Dashpot Components

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