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Home >> Buick >> 1996 >> Roadmaster Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1134 - Ho2S Transition Time Ratio Bank 1, Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform 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. Operate until system goes in "closed loop", engine speed at greater than 1000 RPM but less than 1700 RPM and MAF sensor value between 12-28 gm/s. 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 P1153 test failed, go to step 8). If scan tool does not indicate that DTC P1153 test failed, go to next step.
  4. Check exhaust system for leaks. Repair as necessary. After repairs, go to next step. If exhaust leak is not present, repeat step 2).
  5. Ensure that Bank 1 HO2S 1 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 9). If circuits are okay, go to next step.
  6. Disconnect Bank 1 HO2S 1. Jumper HO2S low signal circuit (PCM side) and ground. Using scan tool, select ENGINE 1 DATA LIST and monitor HO2S voltage. If HO2S voltage is within a range of 375-525 mV, go to next step. If HO2S voltage is not as specified, go to step 10).
  7. Using a jumper wire, jumper BANK 1, HO2S 1 high and low signal circuits (PCM side) to ground. Using scan tool, monitor voltage reading. If voltage reading is less than 200 mV, go to step 12). If voltage reading is greater than 200 mV, go to step 11).
  8. Replace oxygen sensor. Determine cause of sensor contamination, otherwise new sensor will be damaged. After replacing oxygen sensor, go to step 13).
  9. Repair or replace wiring or terminal as necessary. After repairs, go to step 13).
  10. Repair open in sensor low signal circuit or grounded high signal circuit. After repairs, go to step 13).
  11. Repair open in sensor high signal circuit or faulty PCM connectors. After repairs, go to step 13).
  12. Replace Bank 1 HO2S 1 sensor. After replacing oxygen sensor, go to next step.
  13. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P1134. Operate vehicle within the 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).
  14. 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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