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HOMESERVICE MANUALSBUICK1996ROADMASTER BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEMS - TESTS W/CODESDIAGNOSTIC TROUBLE CODESDTC P1663 - CHANGE OIL LIGHT CONTROL CIRCUITDIAGNOSTIC PROCEDURES
1996 Buick Roadmaster Base

Diagnostic Procedures

1996 Buick Roadmaster BaseSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, command CHANGE OIL light on and off. If light turns on and off with each command, see DIAGNOSTIC AIDS. If light does not turn on and off with each command, go to next step.
  3. Turn ignition off. Disconnect PCM connector containing the light control circuit. Turn ignition on. If CHANGE OIL light illuminates, go to step 5). If CHANGE OIL light does not illuminate, go to next step.
  4. Using a fused jumper wire, jumper CHANGE OIL light control circuit in PCM harness connector and ground. If light illuminates, go to step 6). If light does not illuminate, go to step 7).
  5. Repair short to ground in CHANGE OIL light control circuit. After repairs, go to step 9).
  6. Check PCM connections. Repair as necessary. After repairs, go to step 9). If connections are okay, go to step 8).
  7. Check for faulty light bulb, open ignition feed to bulb, open control circuit or circuit shorted to battery voltage. Repair as necessary. After repairs, go to step 9).
  8. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to next step.
  9. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P1663. 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, repeat step 2).
  10. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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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.