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Home >> Chevrolet >> 2001 >> Cavalier LS, 2.2 4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Engine Controls Self-Diagnostics - 2.4L) >> Diagnostic Tests >> DTC P0133: Ho2S Slow Response >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 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 HO2S DTCs, refer to other DTCs first before proceeding with this test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  2. The engine is at operating temperature. Operate engine at greater than 1200 RPM for 2 minutes. With a scan tool, observe the O2S voltage parameter. Does scan tool indicate O2S voltage varying outside 400-500 mV? If yes, go to next step. If no, go to step  4 .
  3. Operate vehicle within Failure Records conditions. Does the scan tool indicate this DTC failed this ignition? If yes, go to next step. If no, go to DIAGNOSTIC AIDS  .
  4. Inspect and test for an exhaust leak. Check if O2S is installed correctly. Check for damaged wiring. Did you find and correct the condition? If yes, go to step  13 . If no, go to next step.
  5. Turn ignition off. Disconnect O2S. Jumper O2S low signal circuit to a good ground. Turn ignition on, with engine off. Measure the voltage on the O2S high signal circuit on the PCM side, using a Digital Multimeter (DMM) that is connected to a good ground. Does the voltage measure within 351-551 mV? If yes, go to next step. If no, go to step  8 .
  6. Jumper the high signal circuit to the low signal circuit (PCM side). With a scan tool, observe O2S voltage parameter. Does the scan tool indicate O2S voltage at or about 0 mV? If yes, go to step  9 . If no, go to next step.
  7. Test the low signal circuit for an open or high resistance. Did you find and correct the condition? If yes, go to step  13 . If no, go to step  11 .
  8. Test the high signal circuit for an open or high resistance. Did you find and correct the condition? If yes, go to step  13 . If no, go to step  11 .
  9. Test for poor connections at the O2S. Did you find and correct the condition? If yes, go to step  13 . If no, go to next step.
    10. NOTE: Determine the cause of contamination before replacing the sensor.
  10. Inspect and test for fuel contamination, engine oil or coolant consumption or improper use of RTV sealant. When complete, go to step  13 .
  11. Test for poor connections at the PCM. Did you find and correct the condition? If yes, go to step  13 . If no, go to next step.
  12. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  13. Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions for Running DTC. See CONDITIONS FOR RUNNING DTC  . Does DTC run and pass? If yes, go to next step. If no, go to step  2 .
  14. Using scan tool, observe the stored information and Capture Info. If scan tool displays any undiagnosed DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are set, system is okay.
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