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Home >> Chevrolet >> 2000 >> Venture Plus >> Repair and Diagnosis >> External Pages >> Different car >> Section 154 (Engine Controls - System & Component Testing) >> Computerized Engine Controls >> Electronic Control Module >> Power Circuits
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Power Circuits

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check ECM connectors for corroded or loose connections. Repair as necessary. Disconnect ECM connectors. Using DVOM, check for battery voltage between chassis ground and continuous power terminal(s) at ECM harness connector(s). See WIRING DIAGRAMS  . 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 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 harness connector(s). If battery voltage is present, power circuits are okay. If battery voltage is not present, check IGN fuse. If fuse is okay, check for an open in wire between battery and ignition switch, and between ignition switch and ECM terminal. If wiring is okay, check for a defective ignition switch.
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