LEMON Manuals: Even more car manuals for everyone
Home >> Pontiac >> 2000 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P0160: Ho2S Circuit Insufficient Activity - Bank 2, Sensor 2 >> Diagnostic Procedures

Diagnostic Procedures

  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.
  2. Start and warm engine to normal operating temperature. Increase engine speed to greater than 1200 RPM for 2 minutes. Using scan tool, select ENGINE 1 DATA LIST and monitor HO2S voltage. If voltage is varying outside of 350-550 mV range, go to next step. If voltage is not as specified, go to step  4.
  3. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data and note parameters. Turn ignition off for about 15 seconds. Start engine and operate vehicle within conditions required for this diagnostic to run, and as close to conditions recorded in FREEZE FRAME/FAILURE RECORDS as possible. Select DTC function, and then enter this DTC. If scan tool indicates that this test failed this ignition, go to next step. If scan tool does not indicate that this test failed this ignition, see DIAGNOSTIC AIDS .
  4. Turn ignition on, with engine off. Disconnect HO2S harness connector. Connect a fused jumper wire between ground and PCM harness connector HO2S high and low signal circuits. If voltage is less than 200 mV, go to step  8. If voltage is not less than 200 mV, go to next step.
  5. Remove jumper wire from HO2S low signal circuit. Using DVOM, check voltage between ground and HO2S low signal circuit at HO2S harness connector. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, go to step  7.
  6. Turn ignition off. Disconnect PCM harness connector C1. Check for continuity in HO2S high signal circuit. If continuity is present, go to step  10. If continuity is not present, repair as necessary. After repairs, go to step  12.
  7. Turn ignition off. Disconnect PCM harness connector C1. Check for continuity in HO2S low signal circuit. If continuity is present, go to step  10. If continuity is not present, repair as necessary. After repairs, go to step  12.
  8. Check HO2S circuits for poor connections at HO2S harness connector. Repair as necessary. After repairs, go to step  12. If connections are okay, go to next step.
  9. Replace HO2S. After replacing sensor, go to step  12.
  10. Check HO2S circuits for poor connection at PCM. Repair as necessary. After repairs, go to step  12. If connections are okay, go to next step.
  11. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, 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.
scientia non olet · About LEMON Manuals