LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Pontiac >> 2003 >> Sunfire Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Tests - 2.2L >> Computerized Engine Controls >> Powertrain Control Module >> Power Circuits
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Power Circuits

  1. Using DVOM, check for battery voltage between PCM continuous power terminal(s) and ground. See WIRING DIAGRAMS . If battery voltage is not present, check for open fuse or 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 DMM, check for battery voltage between PCM ignition power terminals and ground. If battery voltage is not present, check PCM/IGN fuse (10-amp) on Alero and Grand Am or PCM fuse (10-amp) on Cavalier and Sunfire. If fuse is okay, check for open in circuit between battery and ignition switch, and between ignition switch and PCM ignition power terminal. If circuits are okay, check for defective ignition switch.
  3. Connect DVOM between ground and PCM starter (crank) signal terminal. On vehicles with M/T, depress clutch pedal. On vehicles with A/T, place gearshift 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 CRNK fuse (10-amp) or fusible link between ignition switch and PCM starter (crank) signal terminal. If fuse or fusible link is okay, check for open in circuit between ignition switch and PCM starter (crank) signal terminal, or check for defective ignition switch.
scientia non olet · About LEMON Manuals