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Home >> Isuzu >> 1996 >> Hombre S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Testing >> DTC P0141 - Ho2S Heater Circuit Sensor 2 >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD 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, observe HO2S 2 voltage reading. If voltage gradually changes towards zero or one volt, go to step 13). If voltage does not gradually change towards zero or one volt, go to next step.
  3. Disconnect HO2S 2 connector. Connect a test light between ground and ignition feed circuit terminal at HO2S 2 harness connector. If test light is on, go to next step. If test light is off, go to step 5).
  4. Connect a test light between ground circuit and ignition feed circuit terminals at HO2S 2 harness connector. If test light is off, go to step 7). If test light is on, go to step 6).
  5. Remove and inspect fuse for HO2S 2 ignition feed circuit. If fuse is blown, go to step 8). If fuse is okay, go to step 9).
  6. Inspect HO2S 2 harness connector for faulty terminals or poor connection. Repair terminals as necessary. After repair is completed, go to step 13). If connector is okay, go to step 10).
  7. Inspect HO2S 2 harness connector for faulty terminals or poor connection. Repair terminals as necessary. After repair is completed, go to step 13). If connector is okay, go to step 11).
  8. Check for short to ground in HO2S 2 ignition feed circuit. Repair wiring as necessary. After repair is completed, replace fuse and go to step 13).
  9. Inspect HO2S 2 harness connector for faulty terminals or poor connection. Repair terminals as necessary. After repair is completed, go to step 13).
  10. Replace oxygen sensor. After repair is completed, go to next step.
  11. Repair open in ground circuit as necessary. After repair is completed, go to step 13).
  12. Repair open in ignition feed circuit. After repair is completed, go to next step.
  13. 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).
  14. 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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