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Home >> Saturn >> 1999 >> SW1 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - System Testing & Engine Component Tests >> Computerized Engine Controls >> Pcm Power & Ground Check >> Power Circuits
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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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