1998 Oldsmobile Cutlass BaseFACTORY OEM SERVICE PROCEDURE

DTC P0463: Fuel Level Sensor Signal Open/Short To Battery: Testing

  1. If BFC diagnostic system check was performed, go to next step. If BFC diagnostic system check was not performed, see procedures in BFC DIAGNOSTIC SYSTEM CHECK  .
  2. Disconnect BFC Gray 24-pin connector C2, terminal A4 (Black wire). Disconnect fuel tank module connector. Using DVOM, check voltage between BFC connector C2, terminal A4 (Black wire) and ground. If zero volts exists, go to next step. If zero volts does not exist, go to step 8).
  3. Back out left I/P wiring harness junction block Black 30-pin connector C3, terminal A12 (Black/White wire). Using DVOM, check resistance between left I/P wiring harness junction block connector C3, terminal A12 (Black/White wire) and fuel tank module harness connector terminal "D" (Black/White wire). If resistance is 0-2 ohms, go to step 5). If resistance is not 0-2 ohms, go to next step.
  4. Repair open in Black/White wire between left I/P wiring harness junction block connector C3 and fuel tank module. Go to step 16).
  5. Back out left I/P wiring harness junction block Gray 30-pin connector C2, terminal A1 (Black wire). Using DVOM, check resistance between left I/P wiring harness junction block connector C2, terminal A1 (Black wire) and left I/P wiring harness junction block connector C3, terminal A12 (Black/White wire). If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 12).
  6. Using DVOM, check resistance between left I/P wiring harness junction block connector C2, terminal A1 (Black wire) and BFC Gray 24-pin connector C2, terminal A4 (Black wire). If resistance is 0-2 ohms, go to step 13). If resistance is not 0-2 ohms, go to next step.
  7. Repair open in Black wire between left I/P wiring harness junction block connector C2 and BFC connector C2. Go to step 16).
  8. Back out left I/P wiring harness junction block Black 30-pin connector C3, terminal A12 (Black/White wire). Using DVOM, check voltage between left I/P wiring harness junction block connector C3, terminal A12 (Black/White wire) and fuel tank module harness connector terminal "D" (Black/White wire). If zero volts exists, go to step 10). If zero volts does not exist, go to next step.
  9. Repair short to battery in Black/White wire between left I/P wiring harness junction block connector C3 and fuel tank module. Go to step 16).
  10. Disconnect left I/P wiring harness junction block Gray 30-pin connector C2, terminal A1 (Black wire). Using DVOM, check voltage between left I/P wiring harness junction block connector C2, terminal A1 (Black wire) and ground. If reading is zero volts, go to step 12). If reading is not zero volts, go to next step.
  11. Repair short to battery in Black wire between left I/P wiring harness junction block connector C2 and BFC connector C2. Go to step 16).
  12. Replace left I/P wiring harness junction block. Go to step 16).
  13. Reconnect all disconnected components. Replace fuel tank module. Go to next step.
  14. Clear DTCs. Check for DTCs. If DTC P0463 exists, go to next step. If DTC P0463 does not exist, go to step 16).
  15. Replace BFC. See REMOVAL & INSTALLATION  . Go to next step.
  16. Clear DTCs. Perform BFC DIAGNOSTIC SYSTEM CHECK  .
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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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