Throttle Opener: Es300
- Start engine and warm engine to normal operating temperature. Shut engine off. Connect scan tool to data link connector No. 3. See Figure. Scan tool is used to read engine RPM.
- Apply parking brake. Place transaxle in Neutral. Start engine and maintain engine at 2500 RPM for 90 seconds and then allow engine to idle. Ensure idle speed is 650-750 RPM.
- Shut engine off. Disconnect and plug vacuum hose at throttle opener near throttle body. See Fig 1. Start engine and note engine speed. Engine speed should be 1100-1700 RPM.
- If engine speed is not within specification, replace throttle body. Shut engine off. Reinstall vacuum hose on throttle opener. Start engine and ensure engine returns to proper idle speed.
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