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Home >> Chevrolet >> 2003 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 20 (Engine Controls - System & Component Testing - 6.6L) >> Computerized Engine Controls >> Engine Control Module & Fuel Injector Control Module >> Power Circuits

Power Circuits

WARNING: This page is about a different variant/trim than selected.
  1. Check ECM/FICM connectors for corroded or loose connections. Repair as necessary. Disconnect ECM/FICM connectors. Using a DVOM, check for battery voltage between chassis ground and continuous power terminal(s) at ECM/FICM 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 ECM/FICM 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 ECM/FICM 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 ECM/FICM terminal. If wiring is okay, check for a defective ignition switch.
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