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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0141: Ho2S Heater Performance - Bank 1, Sensor 2 >> Diagnostic Procedures

Diagnostic Procedures

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS. After performing powertrain diagnostic system check, go to next step.
    2. NOTE: If engine has just been operating, allow engine to cool for about 1/2 hour before proceeding.
  2. Turn ignition on. Using scan tool, observe HO2S voltage parameter. If HO2S voltage varies from bias voltage to more than 600 mV or less than 300 mV, go to INTERMITTENT TROUBLE CODE DETERMINATION  under SELF-DIAGNOSTIC SYSTEM. If HO2S voltage does not vary from bias voltage to more than 600 mV or less than 300 mV, go to next step.
  3. Check ENG SEN fuse (20-amp). If fuse open, go to step  15. If fuse is okay, go to next step.
  4. Disconnect HO2S. Using a test light connected to a good ground, probe HO2S connector terminal "D" (Pink wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  7.
  5. Connect a test light between Pink and Black wires at HO2S connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  8.
  6. Allow HO2S to cool for at least 10 minutes. Measure resistance between Pink and Black wires at HO2S pigtail using a DVOM. If resistance is 5-10 ohms, go to step  9. If resistance is not 5-10 ohms, go to step  14.
  7. Repair open in Pink wire between ENG SEN fuse (20-amp) ground and HO2S terminal "C". After repairs, go to step  16.
  8. Repair open in Black wire between ground and HO2S terminal "C". After repairs, go to step  16.
  9. Check for poor connection at HO2S connector. Repair as necessary. If problem was found and corrected, go to step  16. If problem was not found, go to next step.
  10. Check for continuity of wiring between PCM and HO2S connector terminals "A" (Tan/White wire on Bank 1, Sensor 2; Tan wire on Bank 2, Sensor 1; Gray wire on Bank 1, Sensor 2) and "B" (Purple/White wire on Bank 1, Sensor 2; Purple wire on Bank 2, Sensor 1; Dark Blue wire on Bank 1, Sensor 2). Repair as necessary. If problem was found and corrected, go to step  16. If problem was not found, go to next step.
  11. Check for poor connection at HO2S connector terminals "A" (Tan/White wire on Bank 1, Sensor 2; Tan wire on Bank 2, Sensor 1; Gray wire on Bank 1, Sensor 2) and "B" (Purple/White wire on Bank 1, Sensor 2; Purple wire on Bank 2, Sensor 1; Dark Blue wire on Bank 1, Sensor 2). Repair as necessary. If problem was found and corrected, go to step  16. If problem was not found, go to next step.
  12. Check for poor connection at PCM to HO2S connector terminal "A" (Tan/White wire on Bank 1, Sensor 2; Tan wire on Bank 2, Sensor 1; Gray wire on Bank 1, Sensor 2). Repair as necessary. If problem was found and corrected, go to step  16. If problem was not found, go to next step.
  13. Check for poor connection at PCM to HO2S connector terminal "B" (Purple/White wire on Bank 1, Sensor 2; Purple wire on Bank 2, Sensor 1; Dark Blue wire on Bank 1, Sensor 2). Repair as necessary. If problem was found and corrected, go to step  16. If problem was not found, go to next step.
  14. Replace HO2S. After repairs, go to step  16.
  15. Repair short to ground in wiring between ENG SEN fuse (20-amp) and HO2S connector terminal "D" (Pink wire) and replace faulty fuse. After repairs, go to next step.
  16. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  17. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.
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