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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. If any other DTCs are displayed, diagnose and repair those DTCs first. If only DTCs P0136/P0156 are displayed, go to next step.
  2. Disconnect appropriate oxygen sensor 4-pin connector. Disconnect ECM E9 connector. See Figure. Check continuity between terminals No. 21 (White wire) and No. 29 (Black wire) at ECM E9 connector and appropriate oxygen sensor connector terminal No. 3 (White wire) or No. 3 (Black wire). Resistance should be one ohm or less. Check for short circuit between ECM connector E9 terminals No. 21 (White wire) and No. 29 (Black wire). See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  3. Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Start and warm engine to normal operating temperature. Read voltage output displayed on hand-held tester when engine is snap accelerated to about 4000 RPM 3 times. Voltage should fluctuate from less than .4 volt to .6 volt or more. If voltage is as specified, problem is intermittent. Check component and ECM connections. If voltage is not as specified, replace oxygen sensor No. 2.
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