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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Engine Controls - 3.9L - Troubleshooting & Diagnosis) >> Electronic Ignition (EI) System Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the ignition OFF, remove the fuel pump relay using the J 43244  .
  2. Crank the engine and test for a strong spark on each cylinder spark plug wire using the J 26792  . Ground the companion cylinder spark plug wire of each cylinder when it is tested.
    • If a strong bright blue spark is present on all 6 of the cylinders, remove and inspect all of the spark plugs for proper torque, proper gap, wear, damage and fouling. Refer to SPARK PLUG REPLACEMENT , SPARK PLUG INSPECTION and Ignition System Specifications . Replace the spark plugs if necessary.
    • If there is no spark on any of the cylinders, test the ignition voltage circuit of the ICM for an open/high resistance or short to ground or test the ground circuit of the ICM for an open/high resistance or a faulty ICM.

      The wire circuit resistance should measure less than 3 ohms.

    • If spark is present on one or more of the cylinders, inspect and test the spark plug wires for arching, cuts, rubbing on other components and proper resistance, refer to SPARK PLUG WIRE INSPECTION and Ignition System Specifications or a faulty ICM.
    • If all tests are normal, then the system is operating correctly.
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