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Inspection Procedure 30 - Front Oxygen Sensor System

NOTE: For Engine Control Module (ECM) terminal ID, See Figure . For wiring diagram, see the WIRING DIAGRAMS article.
NOTE: Possible causes are: defective front oxygen sensor, loose connector, open or shorted oxygen sensor wiring circuit or defective ECM.
  1. Check front oxygen sensor. Front oxygen sensor is mounted on outlet elbow on turbocharger, near exhaust pipe. See procedures in the SYSTEM/COMPONENT TESTS article. If front oxygen sensor is okay, go to next step. Replace front oxygen sensor if defective and recheck operation.
  2. Disconnect connector at front oxygen sensor. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 1 (Red wire) on wiring harness side of connector. Battery voltage should exist.
  3. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between front oxygen sensor and MFI relay. MFI relay is located on passenger's side of center console, just in front of emergency brake lever. See Figure . Repair wiring harness as necessary.
    NOTE: The MFI relay provides battery voltage to various other components for the fuel injection system. Consult wiring diagram. See the WIRING DIAGRAMS article.
  4. Reinstall connector on front oxygen sensor. Turn ignition off. Access connectors on ECM. The ECM is located below instrument panel, just in front of center console.
  5. Disconnect 12-pin ECM connector B-55 from ECM. Turn ignition on. Using voltmeter, check voltage between ground and terminal No. 60 (Yellow wire) on 12-pin ECM connector B-55. Battery voltage should exist.
  6. If battery voltage exists, go to step 9). If battery voltage does not exist, go to next step.
  7. Check for defective terminals or connections at connector front oxygen sensor. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the TROUBLE SYMPTOM INSPECTION  .
  8. If no trouble symptom exists, check wiring harness between ECM and front oxygen sensor. Repair wiring harness if necessary.
  9. Check for defective terminals or connections at 12-pin ECM connector B-55. If terminals or connections are defective, repair as necessary. If terminals and connections are okay, check for a trouble symptom. See the TROUBLE SYMPTOM INSPECTION  . If no trouble symptom exists, replace ECM.
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