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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Control System - 4.4L - Troubleshooting & Diagnosis) >> Electronic Ignition (EI) System Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: Verify that the engine is in good mechanical condition before continuing with this diagnostic.
  1. Turn OFF the ignition.
  2. Inspect the fuse that supplies voltage to the ignition coil/modules.
    • If the fuse is open, then test the spliced circuits and the individual ignition coil/modules for a short to ground.
  3. Disconnect the affected ignition coil/module.
  4. Connect a test lamp between the ignition coil/module ignition 1 voltage circuit and a good ground.
  5. With the test lamp still connected, measure for battery voltage between the ignition 1 voltage circuit and a good ground.
    • If the voltage is not within 1 volt of battery voltage, repair the high resistance or the open in the ignition 1 voltage circuit.
  6. Turn OFF the ignition, and all electrical accessories. Allow sufficient time for all of the control modules to power down before taking a resistance measurement.
  7. Measure for a proper value of less than 5 ohms of resistance between the ground circuit of the affected ignition coil/module and a good ground.
    • If the resistance is more than 5 ohms, repair the high resistance or the open in the ground circuit.
  8. Exchange the affected ignition coil/module with the ignition coil/module of a good cylinder.
  9. Start the engine and observe the scan tool.
    • If the misfire transfers with the suspect ignition coil/module, replace as needed.
    • If the misfire does not transfer with the suspect ignition coil/module, observe the component testing procedures below, and replace the spark plug if needed.
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