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Home >> Honda >> 2000 >> CR-V SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Trouble Code Identification >> DTC P0141: Ho2S Heater Circuit Sensor 2 >> 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 ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
    NOTE: If engine has been operating, turn ignition off and allow engine to cool down for about 1/2 hour before proceeding.
  2. Turn ignition on, with engine off. Using scan tool, monitor HO2S 2 voltage reading for at least 2 minutes. If voltage gradually changes by at least 150 mV, go to next step. If voltage does not gradually change by at least 150 mV, go to step  4.
  3. DTC P0141 is intermittent. Go to DIAGNOSTIC AIDS . If any other DTCs are present, diagnose DTCs as necessary.
  4. Disconnect HO2S 2 harness connector. Connect a test light between ground circuit (Brown wire; Black wire after connector) and ignition feed circuit (Pink wire; Brown wire after connector) terminals at HO2S 2 harness connector. Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step  6.
  5. Remove jumper wire. Connect a jumper wire between ground and sensor high circuit (Purple/White wire) terminal on HO2S 2 harness connector. Connect a jumper wire between ground and sensor low circuit (Tan/White wire) terminal on HO2S 2 harness connector. Turn ignition on, with engine off. Monitor HO2S 2 voltage. If voltage is less than 20 mV, replace HO2S and go to step  11. If voltage is 20 mV or greater, go to step  7.
  6. Turn ignition off. Connect a test light between ground and terminal "D" (Pink wire) on HO2S 2 harness connector. Turn ignition on. If test light illuminates, repair open heater ground circuit (Black wire) and go to step  11. If test light does not illuminate, go to step  8.
  7. Turn ignition off. Disconnect jumper wires. Check continuity of Purple/White and Tan/White wires between terminals No. 23 and 24 on PCM harness connector and HO2S 2 harness connector. If continuity exists, go to step  9. If continuity does not exist on either circuit, repair suspect open circuit and go to step  11.
  8. Remove and check for blown OXYGEN fuse (20-amp) for HO2S 2 ignition feed circuit (Pink wire). If fuse is blown, inspect and repair circuit for short to ground. Once repair is complete, go to step  11. If fuse is okay, repair open ignition feed circuit.
  9. Inspect PCM Black harness connector. Ensure connector is clean and tight. Once repair is complete, go to step  11. If PCM harness connector is okay, go to next step.
  10. Replace PCM. Program replacement PCM using appropriate equipment. See PROGRAMMING . After replacing PCM, go to next step.
  11. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function, then enter DTC P0141. If scan tool indicates TEST RAN AND PASSED, go to next step. If scan tool does not indicate TEST RAN AND PASSED, repeat step  2.
  12. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, no problem is indicated at this time.
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