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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the fuse that supplies voltage to terminals X2-1, and X2-17 of the ECM. Verify the fuse is OK.
      IMPORTANT: This DTC will only set if the fuse is open and the circuits are not grounded. The ignition voltage circuits must be tested thoroughly for an intermittent short to ground.
    • If the fuse is open, test the ignition voltage circuit between the open fuse and the ECM for an intermittent short to ground.
  2. Install the fuse.
  3. Disconnect the harness connector X2 at the ECM.
  4. Ignition ON, load test for B+ on both ignition circuit terminals 1, and 17 at the ECM.
    • If less than B+, repair the ignition circuit for an open/high resistance.
  5. If all circuits/connections test OK, replace the ECM.
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