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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 8 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 5.7L)DIAGNOSTIC TESTSDTC P1154: HO2S TRANSITION TIME RATIO - BANK 2, SENSOR 1DIAGNOSTIC PROCEDURES
2001 Chevrolet Cavalier LS, 2.4 T

Diagnostic Procedures

2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  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 DTCs are present (except DTC P1134), 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 P1154 test failed, go to next step. If scan tool does not indicate that DTC P1154 test failed, see DIAGNOSTIC AIDS .
  3. If scan tool indicates that DTC P1134 test failed, go to step  8. If scan tool does not indicate that DTC P1134 test failed, go to next step.
  4. Check exhaust system for leaks. Repair as necessary. After repairs, go to step  14. If exhaust leak is not present, go to next step.
  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  14. If circuits are okay, go to next step.
  6. Disconnect HO2S. Connect a fused jumper wire between ground and HO2S low signal circuit (PCM side). Using scan tool, select ENGINE 1 DATA LIST and monitor HO2S voltage. If HO2S voltage is within 350-550 mV, go to next step. If HO2S voltage is not within 350-550 mV, go to step  10.
  7. Connect a fused jumper wire between battery ground and HO2S high and low signal circuits (PCM side). Using scan tool, monitor voltage. If voltage reading is less than 200 mV, go to step  13. If voltage reading is not less than 200 mV, go to step  9.
  8. Replace oxygen sensor. Determine cause of sensor contamination, otherwise new sensor will be damaged. After replacing oxygen sensor, go to step  14.
  9. Remove jumper from HO2S low circuit. Check voltage between battery ground and HO2S low signal circuit. If voltage reading is about 5 volts, go to step  12. If voltage reading is not about 5 volts, go to step  11.
  10. Repair short to ground or voltage in sensor high signal circuit. After repairs, go to step  14.
  11. Repair open in sensor low signal circuit or faulty PCM connectors. After repairs, go to step  14.
  12. Repair open in sensor high signal circuit or faulty PCM connectors. After repairs, go to step  14.
  13. Replace HO2S. After replacing oxygen sensor, go to next step.
  14. 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 DTC test ran and passed, go to next step. If scan tool does not indicate that this DTC test ran and passed, repeat step  2.
  15. 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.