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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 65 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P1171: FUEL SYSTEM LEAN DURING ACCELERATIONDIAGNOSTIC 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 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Operate the engine at normal operating temperature. Operate the engine above 1200 RPM for 2 minutes. Observe the HO2S 1 voltage parameter using a scan tool. Does the scan tool indicate that the HO2S 1 voltage is less than 300 mV? If yes, go to step  4. If no, go to next step.
  3. Observe the Freeze Frame/Failure Records for this DTC. Turn ignition switch to OFF position for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to next step. If no, go DIAGNOSTIC AIDS .
  4. Turn ignition switch to RUN position. Disconnect the HO2S sensor harness connector. Turn ignition switch to RUN position, engine OFF. Measure the voltage of the HO2S 1 high signal circuit on the PCM side using a DMM. Does the voltage measure 350-550 mV? If yes, go to step  6. If no, go to next step.
  5. Check the HO2S 1 high signal circuit for a short to ground or a short to the HO2S 1 low signal circuit. Did you find and correct the condition? If yes, go to step  11. If no, go to step  8.
  6. The HO2S 1 is detecting a lean condition or may be contaminated. Inspect for the following conditions:
    • HO2S connector water intrusion.
    • Silicone contaminated HO2S.
    • An exhaust leak between the HO2S 1 and the engine. See SYMPTOMS - ENGINE EXHAUST under SYMPTOMS in TROUBLE SHOOTING - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
    • Vacuum leaks.
    • Incorrect fuel pressure. See FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
    • Lean fuel injectors. See FUEL SYSTEM DIAGNOSIS (GASOLINE) under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
    Repair any of the above or similar engine conditions as necessary. Did you find and correct the condition? If yes, go to step  11. If no, go to next step.
  7. Inspect for poor connections at the harness connector of the HO2S 1 sensor. Did you find and correct the condition? If yes, go to step  11. If no, go to step  9.
  8. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  11. If no, go to step  10.
    9. NOTE: Before replacing the HO2S determine and remove any source of contamination.
  9. Replace the HO2S 1. After repair, go to step  11.
  10. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing PCM, go to next step.
  11. Use the scan tool to clear the DTCs. Turn ignition switch to OFF position for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  12. Using a scan tool, observe the CAPTURE INFO. Does the scan tool display any DTCs that you have not diagnosed? If no, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If yes, system is okay at this time.
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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.