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HOMESERVICE MANUALSCHEVROLET2000CAVALIER BASE, 2D COUPE, AUTOMATIC, 4T40E/MN4REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L & 2.4LDIAGNOSTIC TESTSDTC P0133: O2S 1 CIRCUIT - SLOW RESPONSE (2.2L "J" BODY)DIAGNOSTIC PROCEDURES
2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4

Diagnostic Procedures

2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4SECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. If other DTCs are present, diagnose affected DTCs. If no other DTCs are present, go to next step.
  3. Start engine. Ensure engine is at normal operating temperature. Operate vehicle within the conditions required for setting this DTC. Using scan tool, monitor O2S 1 for the following:
    • LEAN/RICH AVG. (ms).
    • RICH/LEAN AVG. (ms).
    • RICH/LEAN-to-LEAN/RICH RATIO (greater than, less than).
    If AVG. values are less than 249 ms, or RATIO is greater than 0.2 or less than 6.0, go to next step. If readings are not as specified, go to step  17 .
  4. Turn ignition off. Check O2S 1 for proper installation. Check condition of O2S 1 circuits and connections. If a problem is found, go to step  9 . If no problems are found, go to next step.
  5. Check exhaust manifold for leaks. Repair as necessary. After repairs, go to step  3 . If no leaks are found, go to next step.
  6. Disconnect O2S 1 connector. Turn ignition on. Using scan tool, monitor O2S 1 voltage. If voltage is 407-509 mV, go to next step. If voltage is not 407-509 mV, go to step  10 .
  7. Connect a jumper wire between ground and signal circuit terminal at O2S 1 harness connector (PCM side). If voltage is less than 200 mV, go to next step. If voltage is 200 mV or greater, go to step  11 .
  8. Replace oxygen sensor. Determine cause of sensor contamination, otherwise new sensor will be damaged. After repairs, go to step  17 .
  9. Repair condition as necessary. DO NOT attempt to repair damaged oxygen sensor connector or wiring. If damage is found, replace oxygen sensor. After repairs, go to step  17 .
  10. Repair short to ground in O2S 1 signal circuit. After repairs, go to step  17 .
  11. Remove jumper wire. Measure voltage between ground and signal circuit at O2S 1 harness connector. If voltage is greater than 407 mV, go to next step. If voltage is not greater than 407 mV, go to step  13 .
  12. Turn ignition off. Reconnect O2S 1 connector. Disconnect PCM harness connectors. Measure resistance between ground and O2S 1 ground circuit terminal at PCM harness connector. If resistance is less than 5 ohms, go to step  14 . If resistance is not less than 5 ohms, repair open in ground circuit. After repairs, go to step  17 .
  13. Turn ignition off. Disconnect PCM harness connectors. Measure resistance of signal circuit between O2S 1 harness connector and PCM harness connector. If resistance is less than 5 ohms, go to step  15 . If resistance is not less than 5 ohms, repair open in sensor signal circuit. After repairs, go to step  17 .
  14. Check O2S 1 low signal circuit terminal connection at PCM harness connector. Repair as necessary. After repairs, go to step  17 . If low signal circuit terminal is okay, go to step  16 .
  15. Check O2S 1 signal circuit terminal connection at PCM harness connector. Repair as necessary. After repairs, go to step  17 . If signal circuit terminal is okay, go to next step.
  16. Replace PCM. Program replacement PCM using required equipment. After repairs, go to next step.
  17. Using scan tool, clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function, and then enter DTC P0133. If scan tool indicates this test ran and passed, go to next step. If scan tool does not indicate this test ran and passed, go to step  2 .
  18. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, system is okay.
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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.