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Diagnosis & Repair

  1. Connect scan tool to DLC No. 3 connector. See Figure. Start vehicle and warm engine to normal operating temperature. Using scan tool, monitor bank No. 1, sensor No. 1 and bank No. 2, sensor No. 2 voltage output. Snap accelerate engine 3 times. Sensors should indicate a rich signal (.5 volt or more) at least once.
  2. If a rich signal is indicated for both sensors at least once, replace ECM and retest. If either sensor does not display a rich signal at least once, check for short or open circuit in wiring harness between ECM and suspect sensor. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary. If wiring harness is okay, replace oxygen sensor and retest.
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