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Home >> Isuzu >> 2000 >> Rodeo LSE, 2.2 D >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Trouble Code Identification >> DTC P1134: Ho2S Transition Time Ratio Bank 1, Sensor 1 >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. Using scan tool, select LAST TEST FAIL. Record any other failed DTCs. If any other DTCs are set, diagnose affected DTC before proceeding. If no other DTC sets, start engine and allow it to idle. Operate vehicle within conditions required to set DTC. Using scan tool, read specified DTC. If scan tool displays DTC P1134 FAILED THIS IGN, go to next step. If scan tool does not display DTC P1134 FAILED THIS IGN, go to DIAGNOSTIC AIDS .
  3. Check exhaust system for leaks. If exhaust leak is found, repair as necessary. Retest system. If no exhaust leak is found, go to next step.
  4. Visually inspect front HO2S for secure installation or corrosion on terminals. Check terminal tension at front HO2S and PCM. Check for damaged wiring. If a problem is found, go to step  7. If no problem is found, go to next step.
  5. Disconnect front HO2S connector. Turn ignition on. Using DVOM, measure voltage between high signal circuit and ground, and low signal circuit and ground. If DVOM reads 3-4 volts, go to next step. If voltage is not as specified, go to step  8.
  6. Turn ignition off. With front HO2S disconnected, use fused jumper wires to ground both front HO2S harness connector high signal and low signal circuits. Turn ignition on. If scan tool reading jumps from .01 volt to .45 volt when jumper is removed, go to step  10. If voltage does not change as specified, go to step  11.
  7. Repair condition as necessary. Retest system.
  8. Check for poor PCM connections or terminal damage. Repair as necessary. Retest system. If no problem is found, go to next step.
  9. Repair open, grounded or shorted signal circuit. Retest system. If no problem is found, go back to step  6.
  10. Remove front HO2S. Check for fuel contamination, improper RTV sealant (White, powdery coating on sensor), and excessive engine oil or coolant consumption. Repair as necessary and go to step  13. If no problem is found, go to step  12.
  11. Replace and reprogram PCM using required equipment. See PROGRAMMING . Retest system.
  12. Replace front HO2S. Retest system.
  13. Before replacing front HO2S, correct cause of contamination. Retest system.
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