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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 4.3 W, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0704-P1272DTC P1153DTC P1153: HO2S INSUFFICIENT SWITCHING BANK 2, SENSOR 1 (4.8L, 5.3L & 6.0L "C" & "K" SERIES)DIAGNOSTIC PROCEDURES
1999 GMC Forward Control 4.3 W, Standard

Diagnostic Procedures

1999 GMC Forward Control 4.3 W, StandardSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
    2. NOTE: If other DTCs 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 P1153 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 P1133 test failed, go to step  8. If scan tool does not indicate that DTC P1133 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 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  9. 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 fused jumper wire between ground and HO2S high and low signal circuits. Using scan tool, monitor voltage. If voltage reading is less than 200 mV, go to step  12. If voltage reading is not less 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 affected HO2S. After replacing 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 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.
  14. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.