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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe between ground and terminal No. 9 (Black wire) at ECM harness connector E6. See Figure. Voltage should be 9-14 volts. If voltage is as specified, replace ECM. If voltage is not as specified, go to next step.
  2. Turn ignition off. Disconnect heated oxygen sensor No. 2 harness connector. Connector is located underneath driver's seat, near center console. It may be necessary to remove driver's seat to access connector. Measure resistance between terminals HT (Black wire) and B+ (Black/Red wire) at heated oxygen sensor No. 2 connector. Resistance should be 11-16 ohms at 68°F (20°C). If resistance is not as specified, replace heated oxygen sensor No. 2. If resistance is as specified, go to next step.
  3. Repair wiring between ECM and heated oxygen sensor No. 2 or between heated oxygen sensor No. 2 and EFI main relay. See WIRING DIAGRAMS article.
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