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HOMESERVICE MANUALSBUICK1999REGAL LSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - SYSTEM TESTING & ENGINE COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSPCM POWER & GROUND CHECKPOWER CIRCUITS
1999 Buick Regal LS

Power Circuits

1999 Buick Regal LSSECTION Power Circuits
  1. Using a voltmeter, check for battery voltage between PCM continuous power terminal(s) and ground. See POWERTRAIN CONTROL MODULE (PCM) CONNECTOR TERMINAL IDENTIFICATION . See Figure. If battery voltage is not present, check for blown fuse or open fusible link. If fuse or fusible link is okay, check for open in circuit between PCM continuous power terminal and power source.
  2. Turn ignition switch to RUN position. Using a voltmeter, check for battery voltage between PCM ignition power terminals and ground. If battery voltage is not present, check IGN fuse. If fuse is okay, check for an open in circuit between battery and ignition switch, and between ignition switch and PCM ignition power terminal. If circuits are okay, check for a defective ignition switch.
  3. Connect voltmeter between ground and PCM starter (crank) signal terminal. On vehicles with manual transmission/transaxle, depress clutch pedal. On vehicles with automatic transmission/transaxle, place gear shift lever in Park. On all vehicles, turn ignition switch to START position. Battery voltage should be present only when ignition switch is in START position.
  4. If voltage is not present, check CRANK fuse or fusible link between ignition switch and PCM starter (crank) signal terminal. If fuse or fusible link is okay, check for an open in circuit between ignition switch and PCM starter (crank) signal terminal, or check for a defective ignition switch.
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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.