G6 2005-2007

Ignition Coil Module

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Removal & Installation



2.4L Engine
  1. Remove the intake manifold cover.
  2.  
  3. Disconnect the ignition coil electrical connector.
  4.  
  5. Remove the ignition coil bolts.
  6.  
  7. Remove the ignition coil
  8.  

To install:

  1. Install the ignition coils.
  2.  
  3. Install the ignition coil bolts and tighten to 89 inch lbs. (10 Nm).
  4.  
  5. Connect the ignition coil electrical connectors.
  6.  
  7. Install the intake manifold cover.
  8.  

3.5L Engine
  1. Remove the intake manifold cover.
  2.  
  3. Remove the 4 screws securing the ignition coil and module assembly to the bracket.
  4.  
  5. Remove the ignition coil and module assembly.
  6.  

To install:

  1. Install the ignition coil and module assembly to the bracket.
  2.  
  3. Install the ignition coil and module assembly screws and tighten to 40 inch lbs. (4.5 Nm).
  4.  
  5. Connect the spark plug wires.
  6.  
  7. Install the intake manifold cover.
  8.  

3.9L Engine
  1. Remove the intake manifold cover.
  2.  
  3. Disconnect the manifold absolute pressure (MAP) sensor electrical connector.
  4.  
  5. Disconnect the ignition coil electrical connector.
  6.  
  7. Disconnect the spark plug wires from the ignition coils.
  8.  
  9. Remove the ignition coil bolts.
  10.  
  11. Remove the ignition coil nuts.
  12.  
  13. Remove the ignition coil.
  14.  
  15. Remove the ignition coil studs, if necessary.
  16.  

To install:

  1. Install the ignition coil studs, if necessary.
  2.  
  3. Install the ignition coil.
  4.  
  5. Install the ignition coil nuts and tighten to 15 ft. lbs. (20 Nm).
  6.  
  7. Install the ignition coil bolts and tighten to 15 ft. lbs. (20 Nm).
  8.  
  9. Connect the spark plug wires to the ignition coils.
  10.  
  11. Connect the ignition coil electrical connector.
  12.  
  13. Connect the MAP sensor electrical connector.
  14.  
  15. Install the intake manifold cover.
  16.  

Testing



2.4L Engine
  1. Ignition OFF, disconnect the ignition coil/module harness connector at the affected ignition coil/modules.
  2.  
  3. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the ground circuit terminal 1or A and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  4.  
  5. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal 2 or B and ground. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
    NOTE
    If the ignition fuse is open, it will be necessary to test the spliced ignition circuits and the components for a short to ground.

  6.  
  7. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 4 or D and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  8.  
  9. Exchange the affected ignition coil/module with the ignition coil/module of a good cylinder.
  10.  
  11. Start the engine, observe the scan tool Misfire Current Cylinder parameters.
    1. If the misfire transfers with the suspect ignition coil/module, replace as needed.
    2.  
    3. If the misfire does not transfer with the suspect ignition coil/module, refer to the Component Testing procedures below, and replace the spark plug if necessary.
    4.  

  12.  

3.5L & 3.9L Engines
  1. With positive polarity to the low reference terminal, measure for 9,000-11,000 ohms at 20-23°C (68-74°F) room temperature between each of the ignition coil control terminals and the low reference terminal of the ICM.
  2.  
  3. Measure for 7,000-15,000 ohms at 68-74°F (20-23°C) room temperature between each pair of coil towers on the ICM.
  4.  
  5. If the resistance is not within the specified range, replace the ICM.
  6.  

3.6L Engine
  1. Turn OFF the ignition.
    NOTE
    This engine application uses 2 fuses, one for each bank, to supply ignition 1 voltage to the ignition module/coil assemblies and also to the fuel injectors. A good indication that a fuse is open is that all 4 misfire counters are incrementing on one side of the engine.

  2.  
  3. Inspect both fuse that supplies ignition voltage to the ignition module/coils. If a fuse is open, test all ignition voltage circuits to the ignition module/coils or the fuel injectors on the engine bank, for a short to ground.
  4.  
  5. Disconnect the ignition module/coil, and the fuel injector electrical connectors, for the engine bank that has the open fuse.
  6.  
  7. Replace the open fuse with a new fuse.
  8.  
  9. Ignition ON, engine OFF.
  10.  
  11. Reconnect each ignition module/coil, and fuel injector electrical connectors, one at a time. If the fuse opens when connecting an ignition module/coil or fuel injector electrical connector, then replace the component that caused the fuse to open.
  12.  
  13. Ignition OFF, disconnect the appropriate ignition module/coil electrical connector.
  14.  
  15. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit and ground. If the test lamp does not illuminate test the ignition voltage circuit for an open/high resistance.
  16.  
  17. Verify that a test lamp illuminates between the ignition module/coil ground circuit and B+ .If the test lamp does not illuminate, test the ignition module/coil ground circuit for an open/high resistance.
  18.  
  19. Inspect and measure the resistance of the spark plug wire.
  20.  
  21. If the resistance value is not within the specified range, or does not pass the inspection, replace the spark plug wire.
  22.  
  23. Exchange the misfiring cylinder, ignition module/coil assembly with the ignition module/coil assembly from a non-misfiring cylinder.
  24.  
  25. Start and idle the engine. Observe the misfire counters on the scan tool.
    1. If the misfire transfers with the suspect ignition module/coil, then replace the ignition module/coil assembly.
    2.  
    3. If the misfire does not transfer with the suspect ignition module/coil, then measure the resistance of the IC circuit. The IC circuit should measure less than 5 ohms. If the circuit tests normal, replace the ECM.
    4.  

  26.  

 
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