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Home >> Isuzu >> 1999 >> Hombre S, 2.2 4, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Tests (2.2L) >> Diagnostic Trouble Code Identification >> DTC P0133: O2S Slow Response Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

  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.
  2. If other DTCs are present, diagnose affected DTC(s). If no other DTCs are present, go to next step.
  3. Install Tech 2 scan tool. Start engine. Ensure engine is at normal operating temperature. Operate vehicle within the conditions required for setting this DTC. Using scan tool, monitor the following:
    • LEAN/RICH AVG. (249 ms).
    • RICH/LEAN AVG. (249 ms).
    • RICH/LEAN RATIO (greater than 3.75).
    • LEAN/RICH RATIO (less than 0.4).

    If scan tool values are about as specified, go to next step. If scan tool values are not as specified, go to step  18 .

  4. Inspect the following:
    • Check for proper O2S 1 installation.
    • Check O2S 1 connector and wiring for corrosion or damage.
    • Check O2S 1 ground circuit.

    If a problem is found, go to step  9 . If no problems are found, go to next step.

  5. Check exhaust manifold for leaks. Repair as necessary. After repair is completed, repeat step  3 . If exhaust is okay, go to next step.
  6. Disconnect O2S 1 connector. Turn ignition on. Using scan tool, monitor O2S 1 voltage. If voltage is 407-509 mV, go to next step. If voltage is not 407-509 mV, go to step  10 .
  7. Connect a jumper wire between ground and signal circuit (Purple wire) terminal at O2S 1 harness connector. If voltage is less than 200 mV, go to next step. If voltage is 200 mV or greater, go to step  11 .
  8. Replace oxygen sensor. Determine cause of sensor contamination, otherwise new sensor will be damaged. After repair is completed, go to step  17 .
  9. Repair PCM and O2S 1 wiring and/or terminal faults as necessary. DO NOT attempt to repair damaged oxygen sensor connector or wiring. If damage is detected, replace oxygen sensor. After repairs, go to step  17 .
  10. Repair short to ground in O2S 1 signal circuit (Purple wire). After repairs, go to step  17 .
  11. Remove jumper wire from ground and O2S 1 signal circuit (Purple wire). Measure voltage between ground and signal circuit at O2S 1 harness connector. If voltage is greater than 407 mV, go to next step. If voltage is less than 407 mV, go to step  13 .
  12. Turn ignition off. Reconnect O2S 1 connector. Disconnect PCM connectors. Check resistance between ground and O2S 1 ground circuit (Tan wire) terminal at PCM connector. If resistance is less than 5 ohms, go to step  14 . If resistance is not less than 5 ohms, repair open in ground circuit. After repairs, go to step  17 .
  13. Turn ignition off. Disconnect PCM harness connectors. Check resistance of signal circuit (Purple wire) between O2S 1 harness connector and PCM connector. If resistance is less than 5 ohms, go to step  15 . If not, repair open in sensor signal circuit. After repairs, go to step  17 .
  14. Check O2S 1 ground circuit (Tan wire) terminal connection at PCM connector. Repair or replace terminal as necessary. After repairs, go to step  17 . If ground circuit terminal is okay, go to step  16 .
  15. Check O2S 1 signal circuit (Purple wire) terminal connection at PCM connector. Repair or replace terminal as necessary. After repairs are complete, go to step  17 . If ground circuit terminal is okay, go to next step.
  16. Replace PCM. Program replacement PCM using appropriate equipment. After replacing PCM, go to next step.
  17. 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 P0133. 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 .
  18. 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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