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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.
  1. Check for other DTCs. If other DTCs are output, diagnose those DTCs first. If no other DTCs are output, go to next step.
  2. Check whether or not a foreign body is caught between the throttle valve and housing. Clean as necessary. If okay, go to next step.
  3. 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.
  4. Replace the ECM. Clear DTC. Operating hand held tester, erase codes or disconnect battery terminal or remove EFI and ECTS fuses. Start and warm up the engine. Run engine at idle for 5 minutes or more. Read output DTC using hand-held tester or the OBD-II scan tool. If no DTC is output, system is okay. If DTC is output, replace throttle body.
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