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Home >> Chevrolet >> 1998 >> Forward Control P30, 6.5 F, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Controls - Tests W/Codes - 7.4L) >> Diagnostic Trouble Codes >> DTC P1133 - Ho2S Insufficient Switching Bank 1, Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Using scan too, check if any other DTCs are set. If any other DTCs are set, go to applicable DTC test. If no other DTCs are set, go to step 3).
  3. Start and operate engine at idle. Increase engine speed to 1200-2000 RPM and hold for 2 minutes. Using scan tool, monitor HO2S. If HO2S voltage fluctuates 0.3-0.6 volt, go to next step. If HO2S voltage does not fluctuate 0.3-0.6 volt, go to step 5).
  4. Operate engine steady at 1200-2000 RPM. If scan tool indicates that system is in closed-loop, see DIAGNOSTIC AIDS. If scan tool does not indicate that system is in closed-loop, go to step 8).
  5. Operate engine steady at 1200-2000 RPM. If HO2S voltage stays within 0.3-0.6 volt range longer that it switches from this range, go to step 8). If voltage does not stay within 0.3-0.6 volt range, go to next step.
  6. Check VCM connector terminal at HO2S signal and low circuits. If problem is found, go to step 10). If connector is okay, go to next step.
  7. Check for poor connection at HO2S connector. Repair as necessary. After repairs, go to step 10). If connection is okay, go to step 9).
  8. Check HO2S for silicon contamination, leading, incorrect gasket sealer or fouling. Replace as necessary. After replacing plugs, go to next step. If plugs were okay, go to step 11).
  9. Replace HO2S. After replacing sensor, go to step 11).
  10. Repair as necessary. After repairs, 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 this DTC. 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 DTCs are displayed, go to applicable DTC test.
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