1998 Oldsmobile Cutlass BaseFACTORY OEM SERVICE PROCEDURE

DTC U2003: Transmitted SPI Data Input High: 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 instrument cluster Gray 24-pin connector. Disconnect BFC Gray 24-pin connector C2. Using DVOM, check voltage between BFC harness connector C2, terminal B7 (Light Blue/Black wire) and ground. If greater than zero volts exists, go to next step. If greater than zero volts does not exist, go to step 4).
  3. Repair short to battery in Light Blue/Black wire between BFC connector C2 and instrument cluster. Go to step 11).
  4. Reconnect BFC connector C2. Connect a fused jumper wire between instrument cluster harness connector terminal A2 (Light Blue/Black wire) and ground. Using scan tool, read SPI data input feedback. If SPI data input is LOW, go to step 8). If SPI data input is not LOW, go to next step.
  5. Check for a poor connection at BFC connector C2, terminal B7 (Light Blue/Black wire). If a poor connection exists, go to next step. If connection is okay, go to step 7).
  6. Repair poor connection at BFC connector C2, terminal B7 (Light Blue/Black wire). Go to step 11).
  7. Replace BFC. See REMOVAL & INSTALLATION  . Go to step 11).
  8. Check for a poor connection at instrument cluster connector terminal A2 (Light Blue/Black wire). If a poor connection exists, go to next step. If connection is okay, go to step 10).
  9. Repair poor connection at instrument cluster connector terminal A2 (Light Blue/Black wire). Go to step 11).
  10. Replace instrument cluster. See INSTRUMENT PANEL article. Go to next step.
  11. 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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