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Home >> Pontiac >> 2000 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P1134: Ho2S Transition Time Ratio - Bank 1, Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
    NOTE: If other DTC(s) are present, diagnose affected DTC(s) first.
  2. Start and warm engine to normal operating temperature. Using scan tool, monitor FAIL THIS IGN under DTC info. If scan tool indicates that DTC P1134 test failed, go to next step. If scan tool does not indicate that this test failed, see DIAGNOSTIC AIDS .
  3. If scan tool indicates that DTC P1154 test failed, go to step  8. If scan tool does not indicate that DTC P1154 test failed, go to next step.
  4. Check exhaust system for leaks. Repair as necessary. After repairs, go to step  14. If exhaust leak is not present, go to next step.
  5. Ensure that HO2S is securely installed. Check for corrosion on terminals and terminal tension at sensor and PCM. Check for damaged wiring. Repair as necessary. After repairs, go to step  14. If circuits are okay, go to next step.
  6. Disconnect HO2S. Connect a fused jumper wire between ground and PCM connector (PCM side), HO2S low signal circuit. Using scan tool, select ENGINE 1 DATA LIST and monitor HO2S voltage. If HO2S voltage is within a range of 350-550 mV, go to next step. If HO2S voltage is not within a range of 350-550 mV, go to step  10.
  7. Connect a jumper wire between ground and HO2S high and low signal circuits (PCM side). Using scan tool, monitor voltage. If voltage reading is less than 200 mV, go to step  13. If voltage reading is not less than 200 mV, go to step  9.
  8. Replace oxygen sensor. Determine cause of sensor contamination, otherwise new sensor will be damaged. After replacing oxygen sensor, go to step  14.
  9. Remove jumper wire fro HO2S low circuit. Check voltage between battery ground and HO2S low signal circuit. If voltage reading is about 5 volts, go to step  12. If voltage reading is not about 5 volts, go to step  11.
  10. Repair short to ground or voltage in high signal circuit. After repairs, go to step  14.
  11. Repair open in sensor low signal circuit or faulty PCM connectors. After repairs, go to step  14.
  12. Repair open in sensor high signal circuit or faulty PCM connectors. After repairs, go to step  14.
  13. Replace HO2S. After replacing oxygen sensor, go to next step.
  14. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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