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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 65 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P1134: HO2S TRANSITION TIME RATIO - 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 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. NOTE: If any other DTCs are set except for HO2S DTCs, diagnose the other DTCs first before proceeding with this procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  2. Operate the engine at normal operating temperature. Operate the engine over 1200 RPM for 2 minutes. Using a scan tool, observe the HO2S 1 voltage parameter. Does the scan tool indicate that the HO2S 1 voltage is varying above and below 350-650 mV? If yes, go to next step. If no, go to step  4.
  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. 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, problem is intermittent. Go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
  4. Turn ignition switch to OFF position. Disconnect the HO2S 1 harness connector. Turn ignition switch to RUN position, engine OFF. Using a DMM, measure the voltage of the HO2S 1 high signal circuit on the PCM side to a good ground. Does the voltage measure 350-550 mV? If yes, go to next step. If no, go to step  9.
  5. Turn ignition switch to OFF position. Connect a 3-amp fused jumper wire between the HO2S 1 high signal circuit and the HO2S 1 low signal circuit. Turn ignition switch to RUN position, engine off. Using a scan tool, monitor the HO2S 1 voltage for the sensor that applies to this DTC. Does the scan tool indicate that the HO2S 1 voltage is less than 20 mV? If yes, go to next step. If no, go to step  10.
  6. Turn ignition switch to OFF position. Remove the 3-amp fused jumper wire. Connect a test light between the ignition 1 voltage circuit and a good ground. Do not use the HO2S 1 heater low control. Turn ignition switch to RUN position, engine OFF. Does the test light illuminate? If yes, go to next step. If no, go to step  11.
  7. Connect a test light between the ignition 1 voltage circuit and the HO2S 1 heater low control circuit. Turn ignition switch to RUN position, engine OFF. Using a scan tool, command the HO2S 1 heater ON and OFF. Does the test light turn ON and OFF with each command? If yes, go to step  14. If no, go to next step.
  8. Does the test light remain illuminated with each command? If yes, go to step  12. If no, go to step  13.
  9. Check the HO2S 1 high signal circuit for the following conditions:
    • Open circuit.
    • High resistance.
    • Short to ground.
    • Short to voltage.

    Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.

  10. Check the HO2S 1 low signal circuit for an open, a high resistance, or a short to voltage. Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.
  11. Check the ignition 1 voltage circuit for an open, a high resistance, or a short to ground. Replace the ERLS fuse (Cavalier & Sunfire) or AUTO TRANS fuse (Alero & Grand AM), if necessary. Did you find and correct the condition? If yes, go to step  19. If no, go to step  13.
  12. Check the HO2S 1 heater low control circuit for a short to ground. Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.
  13. Check the HO2S 1 heater low control circuit for an open, a high resistance, or a short to voltage. Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.
    14. CAUTION: Before replacing the HO2S 1, check and remove any source of contamination to prevent damage to new HO2S.
  14. Inspect for the following conditions:
    • The use of incorrect silicone RTV sealant.
    • Fuel contamination.
    • An exhaust leak.
    • The HO2S is installed correctly.
    • Damaged wiring.
    Did you find and correct the condition? If yes, go to step  19. If no, go to next step.
  15. Inspect for poor connections at the harness connector of the HO2S 1. Did you find and correct the condition? If yes, go to step  19. If no, go to step  17.
  16. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  19. If no, go to step  18.
  17. Replace the HO2S 1. After repair, go to step  19.
  18. 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.
  19. Using scan tool, clear DTCs. Turn ignition switch to OFF position for 30 seconds. Start the engine. Operate vehicle within Conditions for Running DTC. See CONDITIONS FOR RUNNING DTC . Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  20. Using a scan tool, observe the CAPTURE INFO. Does scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
RENDER: 1.0x

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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.