1998 Chevrolet Lumina BaseFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Start engine and allow it to reach operating temperature. Place gear selector in Park or Neutral, and apply parking brake. Increase engine speed to greater than 1200 RPM for 2 minutes. Using scan tool, read HO2S 2 voltage. If voltage is varying outside of 400-500 mV range, go to next step. If voltage is varying as specified, go to step 4).
  3. Turn engine off. Turn ignition on, engine off. Using scan tool, read and record FAIL RECORDS data. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P0140 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0140 FAILED THIS IGN, see DIAGNOSTIC AIDS.
  4. Disconnect HO2S 2 harness connector. Connect a jumper wire between HO2S 2 harness connector signal and low circuits to ground. If voltage is less than 150 mV, go to step 8). If voltage is not less than 150 mV, go to next step.
  5. Remove jumper wire. Using DVOM, check voltage between HO2S 2 harness connector signal and heater ground circuits. If voltage is about 950 mV, go to next step. If voltage is not as specified, go to step 7).
  6. Turn ignition off. Disconnect PCM harness connectors. Check resistance of HO2S 2 harness connector ground circuit. If resistance is greater than 5 ohms, repair open or faulty connection. After repairs, go to step 13). If resistance is not greater than 5 ohms, go to step 9).
  7. Turn ignition off. Disconnect PCM harness connectors. Check resistance of HO2S 2 harness connector signal circuit. If resistance is greater than 5 ohms, repair open or faulty connection. After repairs, go to step 13). If resistance is not greater than 5 ohms, go to step 10).
  8. Check for faulty connection at HO2S 2. If faulty connection is found, repair as necessary. After repairs, go to step 13). If connection is okay, go to step 11).
  9. Check for faulty connection at PCM. If faulty connection is found, repair as necessary. After repairs, go to step 13). If connection is okay, go to step 12).
  10. Check for faulty connection at PCM. If faulty connection is found, repair as necessary. After repairs, go to step 13). If connection is okay, go to step 12).
  11. Replace HO2S 2. After replacing sensor, go to step 13).
  12. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  13. Using scan tool, read and record FAIL RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, select SPECIFIC DTC INFO for DTC P0140. If scan tool displays DTC P0140 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P0140 FAILED THIS IGN, repair is complete.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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