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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0161: Ho2S Heater Performance - Bank 2, Sensor 2 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  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.
    NOTE: If engine has been operating, allow engine to cool down for about 30 minutes before proceeding with tests.
  2. Turn ignition off. Turn ignition on, with engine off. Using scan tool, select ENGINE 1 DATA LIST and monitor HO2S voltage. If voltage changes from bias voltage to greater than 700 mV or less than 300 mV, see DIAGNOSTIC AIDS . If voltage does not change from bias voltage to less than 300 mV or greater than 700 mV, go to next step.
  3. Check HO2S ignition feed fuse. If fuse is open, go to step  11. If fuse is okay, go to next step.
  4. Raise and support vehicle. Disconnect HO2S harness connector. Connect test light to chassis ground and probe ignition feed circuit at HO2S harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  7.
  5. Connect test light between ignition feed circuit and heater ground circuit at HO2S harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  8.
  6. Using DVOM, check resistance between ignition feed and heater ground circuits at HO2S harness connector. Resistance should be 3.5-14.0 ohms. If resistance is as specified, go to step  9. If resistance is not as specified, go to step  10.
  7. Repair open in HO2S ignition feed circuit. After repairs, go to step  12.
  8. Repair open in HO2S heater ground circuit. After repairs, go to step  12.
  9. Check for poor terminal connection at HO2S harness connector. Repair as necessary. After repairs, go to step  12. If connections are okay, go to next step.
  10. Replace HO2S. After replacing sensor, go to step  12.
  11. Locate and repair short to ground in HO2S ignition feed circuit and replace fuse. After repairs, go to next step.
  12. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, and then enter this DTC. 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.
  13. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
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