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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 244 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - 6.0L W/BiFuel & CNG) >> Computerized Engine Controls >> Fuel Injector Control Module & Powertrain Control Module >> Power Circuits

Power Circuits

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Savana, 2003 Chevrolet Silverado, and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check FICM or PCM connectors for corroded or loose connections. Repair as necessary. Disconnect FICM or PCM connectors. Using a DVOM, check for battery voltage between chassis ground and continuous power terminal(s) at FICM or PCM harness connector(s). If battery voltage is present, go to next step. If battery voltage is not present, check for open fuse or fusible link. If fuse or fusible link is okay, check for open in wire between FICM or PCM terminal and power source.
  2. Turn ignition switch to RUN position. Using DVOM, check for battery voltage between chassis ground and ignition power terminals at FICM or PCM harness connector(s). If battery voltage is present, power circuits are okay. If battery voltage is not present, check related fuse. If fuse is okay, check for an open in wire between battery and ignition switch, and between ignition switch and FICM or PCM terminal. If wiring is okay, check for a defective ignition switch.
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