LEMON Manuals: Even more car manuals for everyone
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 P0134: O2S Insufficient Activity 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. Install Tech 2 scan tool. Ensure engine is at normal operating temperature. Start engine. Increase engine speed to 1200 RPM for 2 minutes. If scan tool indicates closed loop, go to next step. If scan tool does not indicate closed loop, go to step  4 .
  3. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data, and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. If scan tool indicates closed loop, go to next step. If scan tool does not indicate closed loop, go to step  12 .
  4. Turn ignition on, with engine off. Disconnect O2S 1 connector. Connect a jumper wire between ground and sensor signal circuit (Purple wire) terminal at O2S 1 harness connector. If voltage is less than 200 mV, go to next step. If voltage is not less than 200 mV, go to step  6 .
  5. Turn ignition off. Inspect O2S 1 harness connector for faulty terminals or poor connection. Repair faulty terminals or poor connection as necessary. After repairs, go to step  12 . If connector is okay, go to step  9 .
  6. Turn ignition on, with engine off. Disconnect jumper wire. Using DVOM, measure voltage between ground and sensor signal circuit (Purple wire) terminal at O2S 1 harness connector. If voltage is greater than 600 mV, go to step  10 . If displayed voltage is less than 600 mV, go to next step.
  7. If voltage reading in step 6)  is less than 300 mV, go to step  11 . If voltage reading is not less than 300 mV, go to next step.
  8. Replace PCM. Program new PCM using appropriate equipment. After replacing PCM, go to next step.
  9. Replace oxygen sensor. After replacing sensor, go to step  12 .
  10. Check O2S 1 ground circuit (Tan wire) for open or poor connection at PCM. Repair as necessary. After repairs, go to step  9 . If circuit is okay, go to step  8 .
  11. Check O2S 1 signal circuit (Purple wire) for open or poor connection at PCM. Repair as necessary. After repairs, go to next step. If circuit is okay, go to step  8 .
  12. 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 P0134. 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 .
  13. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, no problem is indicated at this time.
scientia non olet · About LEMON Manuals