Diagnosis & Repair
WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
- Check whether or not a foreign body is caught between the throttle valve and housing. Repair as necessary. If okay, go to next step.
- Disconnect the throttle control motor connector. Measure the resistance between the terminals of throttle control motor terminals No. 1 and 2. See Figure. Resistance should be .3-100 ohms at 68°F (20°C). If resistance is to specification, go to next step. If resistance is not to specification, replace throttle body assembly.
- Disconnect the T2 throttle control motor 2-pin connector. See Figure. Disconnect the ECM E2 connector. Check the continuity between the wire harness side connectors. See Figure. See THROTTLE CONTROL MOTOR/ECM CONTINUITY CHECK table. If continuity is to specification, problem is intermittent. If continuity is not to specification, repair or replace harness and connector as necessary.