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Home >> GMC >> 1997 >> Forward Control 4.3 W, L35, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls - Tests W/Codes - 7.4L (P Series)) >> Diagnostic Trouble Codes >> DTC P0153 - Ho2S Slow Response Bank 2, Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the F - BASIC TESTING - 7.4L article. After performing OBD system check, go to next step.
  2. Check if any other HO2S DTCs are set. If any other HO2S DTCs are set, go to applicable DTC test. If no other HO2S DTCs are set, go to next step.
  3. Install scan tool. With engine idling, monitor MAP sensor voltage using scan tool. If MAP sensor voltage is greater than 4 volts, go to DTC P0108 . If MAP sensor voltage is not greater than 4 volts, go to next step.
  4. Visually inspect exhaust system near HO2S for leaks. If a problem was found, go to step 8). If a problem was not found, go to next step.
  5. Visually inspect if HO2S was properly installed. If a problem was found, go to step 8). If a problem was not found, go to next step.
  6. Check if HO2S connection is contacting engine or exhaust system. If a problem was found, go to step 8). If a problem was not found, go to next step.
  7. Remove HO2S and inspect for silicone contamination (a white powdery deposit on portion of sensor exposed to exhaust stream). Also, inspect for engine oil/coolant or lead contamination. If contamination is found, go to step 9). If contamination is not found, see DIAGNOSTIC AIDS.
  8. Repair as necessary. After repairs, go to step 11).
  9. Repair source of contamination. After repairs, go to next step.
  10. Replace HO2S. After replacing sensor, go to next step.
  11. 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).
  12. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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