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Home >> Honda >> 2000 >> CR-V SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Engine Controls - Self-Diagnostics - 4.3L) >> Diagnostic Trouble Code Identification >> DTC P0135: Ho2S Heater Circuit Bank 1, Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD-II) System Check. See SELF-DIAGNOSTICS - INTRODUCTION article. Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Ensure Tech 2 scan tool is installed. Turn ignition off. Turn ignition on, engine off. Using scan tool, read HO2S voltage. If voltage gradually decreases 0.15 volt, see DIAGNOSTIC AIDS . If voltage does not decrease as indicated, go to next step.
    NOTE: If engine has been operating, allow engine to cool for about one hour before proceeding with tests.
  3. Check ENG 1 fuse (10-amp). If fuse is open, go to step  12. If fuse is okay, go to next step.
  4. Turn ignition off. Disconnect HO2S harness connector. Using a test light connected to chassis ground, probe HO2S ignition feed circuit (Pink wire) at HO2S harness connector. If test light comes on, go to next step. If test light does not come on, go to step  7.
  5. Connect test light between HO2S ignition feed circuit (Pink wire) and sensor ground (Black wire). If test light comes on, go to next step. If test light does not come on, go to step  8.
  6. Allow HO2S to cool for at least 10 minutes. Using DVOM, measure resistance between HO2S ignition feed circuit (Pink wire) and HO2S heater ground (Black wire) at sensor harness connector. If resistance is 3-10 ohms, go to step  9. If resistance is not 3-10 ohms, go to step  11.
  7. Repair open HO2S ignition feed circuit (Pink wire). After repair, go to step  14.
  8. Repair open HO2S heater ground circuit (Black wire). After repair, go to step  14.
  9. Check for faulty HO2S harness connection(s). If faulty connection is found, repair or replace as necessary. After repair, go to step  14. If connection is okay, go to next step.
  10. Turn ignition off. Disconnect VCM harness connectors. Using DVOM, measure resistance between HO2S signal circuit (Purple/White wire) and HO2S low circuit (Tan/White wire) at HO2S harness connector. If resistance is greater than 5 ohms, go to step  13. If resistance is less than 5 ohms, go to next step.
  11. Replace HO2S. After replacing sensor, go to step  14.
  12. Check for short to ground in HO2S ignition feed circuit (Pink wire). Repair or replace as necessary. Replace fuse and go to step  14.
  13. Repair open or poor connection in HO2S signal circuit (Purple/White wire) or HO2S low circuit (Tan/White wire). After repair, go to next step.
  14. Allow engine to cool for half an hour. Turn ignition on, with engine off. Using scan tool, select DTC, CLEAR INFO function. Monitor HO2S voltage. If voltage gradually decreases 0.15 volt, go to next step. If voltage does not decrease as indicated, go to step  3.
  15. Using scan tool, select Read and Record INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, system is okay.
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