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Home >> Saturn >> 2010 >> Sky Red Line, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L - Troubleshooting And Diagnosis >> Electronic Ignition System Diagnosis >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the affected ignition coil/modules.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance.
  5. Exchange the affected ignition coil/module with the ignition coil/module of a good cylinder.
  6. Start the engine, observe the scan tool Misfire Current Cylinder parameters.
    • If the misfire transfers with the suspect ignition coil/module, replace it.
    • If the misfire does not transfer with the suspect ignition coil/module, replace the spark plug.
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