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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 P0130: Ho2S Circuit Malfunction - Bank 1, Sensor 1 >> 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. Using scan tool, clear DTCs. Reset fuel trim values. Start engine and run to normal operating temperature. Using scan tool, select ENGINE 1 DATA LIST and monitor appropriate HO2S voltage with engine at idle. Voltage should swing rapidly from more than to less than 300-600 mV range. If HO2S voltage is fixed between 300-600 mV, go to step  4. If HO2S voltage is not fixed between 300-600 mV, go to next step.
  3. Condition that set this DTC is not present. DTC may have been set by one of the following conditions: HO2S connector water intrusion, intermittently open HO2S high signal circuit, intermittently open HO2S low signal circuit, HO2S low signal circuit with high resistance to ground, PCM ground circuits with high resistance to ground, inoperative HO2S heater, poor HO2S or PCM connector terminal contact, exhaust system leak (typically within 12" upstream of HO2S or defective HO2S. Repair as necessary. If problem was found and repaired, go to step  17 If problem was not found and corrected, see INTERMITTENT TROUBLE CODE DETERMINATION  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition off. Disconnect suspect HO2S connector for corresponding DTC. Connect a jumper wire between ground and suspect HO2S connector terminal "A" (Tan/White wire for Bank 1, Sensor 1; Tan wire for Bank 2, Sensor 1; Gray wire for Bank 1, Sensor 2). Monitor HO2S voltage using scan tool. If voltage reading is less than 20 mV, go to step  7. If voltage reading is 20 mV or more, go to next step.
  5. Turn ignition off. Remove jumper wire from the HO2S terminal. Disconnect PCM connectors. Using DVOM, measure continuity of suspect HO2S high signal circuit (Purple/White wire for Bank 1, Sensor 1; Purple wire for Bank 2, Sensor 1; Dark Blue wire for Bank 1, Sensor 2) and then HO2S low signal circuit (Tan/White wire for Bank 1, Sensor 1; Tan wire for Bank 2, Sensor 1; Gray wire for Bank 1, Sensor 2) between PCM connectors and suspect HO2S connector. If resistance of both circuits is less than 5 ohms, go to next step. If resistance of both circuits is 5 ohms or more, go to step  9.
  6. Inspect for poor connections at PCM connectors. Repair as necessary. After repairs, go to step  17. If circuit is okay, go to step  16.
  7. Remove jumper wire from HO2S terminals. Connect test light between appropriate HO2S terminals "C" (Black wire) and "D" (Pink wire). Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step  10.
  8. Turn ignition off. Reconnect HO2S connector. Disconnect PCM connectors. Using DVOM, measure resistance between appropriate HO2S low signal terminal (Tan/White wire for Bank 1, Sensor 1; Tan wire for Bank 2, Sensor 1; Gray wire for Bank 1, Sensor 2) and a PCM ground circuit terminal. If resistance is less than 500 ohms, go to step  12. If resistance is 500 ohms or more, go to step  11.
  9. Repair high resistance in appropriate circuit as necessary. After repairs, go to step  17.
  10. Repair wiring to appropriate HO2S terminal "C" (Black wire) or "D" (Pink wire). Probable causes include: open or high resistance circuit, poor ground connection or an open heater fuse (which can also set other DTCs). After repairs, go to step  17.
  11. Repair high resistance between HO2S terminal "B" (Tan/White wire for Bank 1, Sensor 1; Tan wire for Bank 2, Sensor 1; Gray wire for Bank 1, Sensor 2) and a PCM ground circuit terminal. Probable causes include: poor HO2S connector terminal contact, open HO2S circuit (which will require HO2S replacement), poor PCM ground connection, high PCM ground circuit resistance or ungrounded exhaust system. After repairs, go to step  17.
  12. Inspect for exhaust system leaks upstream of suspect HO2S. Leak may be very small and will typically be within 12" of suspect HO2S. Repair exhaust system as necessary. After repairs, go to step  17. If exhaust system is okay, go to next step.
    13. NOTE: Although 500 ohms resistance is allowed, typical resistance should be less than 50 ohms.
  13. Allow engine to cool to ambient temperature. Using DVOM, re-measure resistance between appropriate HO2S terminal "A" and PCM ground circuit terminal. If resistance is less than 500 ohms, go to step  15. If resistance is 500 ohms or more, go to next step.
  14. Remove HO2S from exhaust. Clean HO2S mounting threads. Apply anti-seize compound to sensor threads. Tighten HO2S to specification. See REMOVAL, OVERHAUL & INSTALLATION article. Using DVOM, re-measure resistance between appropriate HO2S terminal "A" and a PCM ground circuit terminal. If resistance is less than 500 ohms, go to step  17. If resistance is 500 ohms or more, go to next step.
  15. Replace suspect HO2S. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After repairs, go to step  17.
  16. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After repairs, go to next step.
  17. 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 in code enable criteria. 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.
  18. 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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