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Home >> Chevrolet >> 1998 >> Forward Control P30, 6.5 F, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - Tests W/Codes - 5.7L) >> Diagnostic Trouble Codes >> DTC P0161 - Ho2S Heater Circuit Bank 2, Sensor 2 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Install scan tool. Turn ignition on, with engine off. Monitor HO2S voltage using scan tool. If HO2S voltage gradually decreases by .15 volt (150 mV), see DIAGNOSTIC AIDS. If HO2S voltage does not gradually decrease by .15 volt (150 mV), go to next step.
  3. Check fuse for HO2S ignition feed circuit. If ignition feed fuse is open, go to step 12). If fuse is okay, go to next step.
  4. Turn ignition off. Disconnect HO2S connector. Using test light, probe HO2S connector terminal "D" (engine harness side) to ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
  5. Connect test light between terminals "C" and "D" of HO2S connector (engine harness side). If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
  6. Allow HO2S to cool down for at least 10 minutes. Check resistance between HO2S ignition feed and heater ground at HO2S pigtail. If resistance is 3-10 ohms, go to step 9). If resistance is not 3-10 ohms, go to step 11).
  7. Repair open in HO2S ignition feed circuit. After repairs, go to step 14).
  8. Check for open in HO2S heater ground circuit. After repairs, go to step 14).
  9. Check for poor connection at HO2S harness terminals. Repair as necessary. After repairs, go to step 14). If connection is okay, go to step 10).
  10. Turn ignition off. Disconnect VCM harness connector. Using DVOM, check resistance between HO2S signal and low circuit. If resistance is greater than 5 ohms, go to step 13). If resistance is not greater than 5 ohms, go to next step.
  11. Replace HO2S. After replacing sensor, go to next step.
  12. Check for short to ground in battery feed circuit. Repair as necessary. Replace fuse. After repairs, go to step 14).
  13. Repair open or poor connection in HO2S signal or low circuits. After repairs, go to next step.
  14. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the 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, repeat step 2).
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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