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Diagnostic Procedure

DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK FRONT OXYGEN (A/F) SENSOR CONNECTOR AND COUPLING CONNECTOR.  Has water entered the connector? Completely remove any water inside. Go to step 2  .
2 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from ECM and front oxygen (A/F) sensor.
  3. Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector.

    Connector & terminal 

    (B135) No. 8 - (E24) No. 3: 

    (B135) No. 20 - (E24) No. 4: 

 Is the resistance less than 1 Ω? Go to step 3  . Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit in harness between ECM and front oxygen (A/F) sensor connector
  • Poor contact of coupling connector
3 CHECK FOR POOR CONTACT. 
Check for poor contact of the front oxygen (A/F) sensor connector.		 Is there poor contact of front oxygen (A/F) sensor connector? Repair the poor contact of front oxygen (A/F) sensor connector. Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR . >
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