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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 P0153 - Ho2S Slow Response Bank 2 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, select ENGINE 1 DATA LIST and operate vehicle within parameters when DTC was set. Using scan tool, select DTC INFO and monitor FAIL THIS IGN data. If scan tool indicates that DTC P0153 test failed, go to next step. If scan tool does not indicate that this test failed, see DIAGNOSTIC AIDS.
  3. If scan tool also indicate that DTC P0133 test failed, go to step 8). If scan tool does not indicate that DTC P0133 test failed, go to next step.
  4. Check exhaust system for leaks. Repair as necessary. After repairs, repeat step 2). If exhaust is okay, go to next step.
  5. Ensure Bank 2 HO2S 1 is securely installed. Check corroded terminals or damaged wiring. Repair as necessary. After repairs, go to step 9). If wiring and terminals are okay, go to next step.
  6. Disconnect Bank 2 HO2S 1. Jumper HO2S ground circuit (PCM side) and chassis ground. Using scan tool, select ENGINE 1 DATA LIST and monitor HO2S voltage. If HO2S voltage is 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 signal and ground circuits to ground. Using scan tool, monitor voltage reading. If voltage is less than 200 mV, go to step 12). If voltage 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 ground circuit or grounded sensor signal circuit. After repairs, go to step 13).
  11. Repair open in sensor signal circuit or faulty PCM connectors. After repairs, go to step 13).
  12. Replace Bank 2 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 P0153. 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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