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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1998 (Engine Controls And Fuel - 3.6L (LCS) - DTC P0638 To DTC P2229) >> DTC P2105 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, open the hood to disable the Auto-Stop function.
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    • If the hood position does not display Open, refer to DTC P254F .
  3. Ignition OFF, remove the fuse that supplies voltage to terminal X2-5 of the ECM. Verify the fuse is OK.
      NOTE: 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.
  4. Install the fuse.
  5. Disconnect the harness connectors of the ECM.
  6. Ignition ON, load test for B+ on the ignition circuit terminal X2-5 of the ECM connector.
    • If less than B+, repair the ignition circuit for an open/high resistance.
  7. If all circuits/connections test OK, replace the ECM.
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