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Home >> Honda >> 2000 >> CR-V SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Trouble Code Identification >> DTC P0141: Rear Ho2S Heater Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Isuzu Rodeo and 2000 Isuzu Amigo. 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. Go to next step.
    NOTE: If engine has been operating, allow engine to cool for about 30 minutes before proceeding with diagnostic tests.
  2. Turn ignition on, engine off. Using scan tool, read HO2S-2 value. If reading varies between greater than .65 volts and less than .25 volts, see DIAGNOSTIC AIDS . If reading is not as specified, go to next step.
  3. Inspect HO2S SENSOR (20-amp) fuse. If fuse is open, go to step  15. If fuse is okay, go to next step.
  4. Turn ignition off. Raise and support vehicle. Disconnect rear HO2S harness connector. Connect a test light to chassis ground, and probe rear HO2S ignition feed circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step  7.
  5. Connect test light between rear HO2S harness connector ignition feed and heater ground circuits (PCM side). If test light illuminates, go to next step. If test light does not illuminate, go to step  8.
  6. Allow rear HO2S to cool for at least 10 minutes. Using DVOM, check resistance between ignition feed and heater ground circuits at rear HO2S harness connector (sensor side). If resistance is 3-6 ohms, go to step  9. If resistance is not as specified, go to step  10.
  7. Repair open rear HO2S ignition feed circuit. Retest system.
  8. Repair open rear HO2S heater ground circuit. Retest system.
  9. Check for faulty connection at rear HO2S. If faulty connection is found, repair as necessary. Retest system. If connection is okay, go to next step.
  10. Turn ignition off. Disconnect PCM connectors. Check resistance of rear HO2S signal high and low circuits. If resistance on either circuit is greater than 5 ohms, repair open or faulty connection. Retest system. If resistance is 5 ohms or less, go to next step.
  11. Check for faulty connection at rear HO2S harness connector. If faulty connection is found, repair as necessary. Retest system. If connection is okay, go to next step.
  12. Check for faulty rear HO2S low signal circuit connection at PCM. If faulty connection is found, repair as necessary. If connection is okay, go to next step.
  13. Check for faulty rear HO2S high signal circuit connection at PCM. If faulty connection is found, repair as necessary. Retest system. If connection is okay, go to next step.
  14. Replace rear HO2S. Retest system.
  15. Locate and repair shorted condition in rear HO2S ignition feed circuit and replace fuse. Retest system.
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