CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

Ignition Coil Module

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Removal & Installation



2.8L & 3.6L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Turn the ignition OFF .
  4.  
  5. Remove the engine appearance cover.
  6.  
  7. Disconnect the air cleaner duct from the throttle body. Disconnect the positive crankcase ventilation (PCV) hose from the camshaft cover. Remove the intake manifold bolts, but do not separate the upper intake manifold from the lower intake manifold.
  8.  
  9. Remove the intake manifold brace bolts and the brace.
  10.  
  11. Remove and reposition the upper intake manifold with the lower intake manifold in order to gain sufficient clearance for ignition coil removal.
  12.  
  13. Remove the ignition coil electrical connector.
  14.  
  15. Remove the ignition coil bolt.
  16.  
  17. Remove the ignition coil(s).
  18.  

To install:

  1. Install the ignition coil(s).
  2.  
  3. Install the ignition coil bolt(s) and tighten to 89 inch lbs. (10 Nm).
  4.  
  5. Install the ignition coil electrical connector(s).
  6.  
  7. Install the intake manifold.
  8.  
  9. Install the engine cover.
  10.  

4.6L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the fuel injector sight shield.
  4.  
  5. Disconnect the individual ignition coil electrical connector, as required.
  6.  
  7. Remove the individual ignition coil bolt, as required.
  8.  
  9. Remove the ignition coil, as required.

    Click image to see an enlarged view

    Fig. 4.6L Engine ignition coil removal

  10.  

To install:

  1. Install the ignition coil, as required.
  2.  
  3. Install the individual ignition coil bolt, as required.
  4.  
  5. Tighten the bolt to 89 inch lbs. (10 Nm).
  6.  
  7. Connect the individual ignition coil electrical connector, as required.
  8.  
  9. Install the fuel injector sight shield.
  10.  

5.7L & 6.0L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the fuel injector sight shield.
    NOTE
    The ignition coils can be removed individually or as an assembly, depending on the repair being performed.

  6.  
  7. If replacing an individual coil, disconnect the wire harness at the coil. If removing the coil assembly, disconnect the main coil harness connector.
  8.  
  9. Disconnect the spark plug wire at the ignition coils.
  10.  
  11. If replacing an individual coil, remove the ignition coil mounting bolts and/or nut that retains the coil to the coil bracket.
  12.  
  13. If removing the coil assembly, remove the bolts securing the coil bracket to the valve rocker arm cover.
  14.  
  15. Remove the ignition coil or coil assembly.
  16.  

To install:

  1. Install the ignition coil or coil assembly.
  2.  
  3. Install the ignition coil bolts and/or nuts.
  4.  
  5. Tighten the coil to bracket bolts/nuts to 106 inch lbs. (12 Nm).
  6.  
  7. Tighten the coil to bracket-to-valve cover bolts/nuts to 106 inch lbs. (12 Nm).
  8.  
  9. Connect the spark plug wires at the ignition coils.
  10.  
  11. Connect the individual ignition coil or main coil harness connector.
  12.  
  13. Install the fuel injector sight shield.
  14.  
  15. Connect the negative battery cable
  16.  

Testing




NOTE
Verify that the engine is in good mechanical condition before continuing with this diagnostic.

  1. Turn OFF the ignition.
  2.  
  3. Inspect the fuse that supplies voltage to the ignition coil/modules.
  4.  
  5. If the fuse is open, then test the spliced circuits and the individual ignition coil/modules for a short to ground.
  6.  
  7. Disconnect the affected ignition coil/module.
  8.  
  9. Connect a test lamp between the ignition coil/module ignition 1 voltage circuit and a good ground.
  10.  
  11. With the test lamp still connected, measure for battery voltage between the ignition 1 voltage circuit and a good ground.
  12.  
  13. If the voltage is not within 1 volt of battery voltage, repair the high resistance or the open in the ignition 1 voltage circuit.
  14.  
  15. 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.
  16.  
  17. 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.
  18.  
  19. If the resistance is more than 5 ohms, repair the high resistance or the open in the ground circuit.
  20.  
  21. Exchange the affected ignition coil/module with the ignition coil/module of a good cylinder.
  22.  
  23. Start the engine and observe the ignition coil with a scan tool.
  24.  
  25. If the misfire transfers with the suspect ignition coil/module, replace as needed.
  26.  
  27. If the misfire does not transfer with the suspect ignition coil/module, observe the ignition coil component testing procedures below, and replace the spark plug if needed.
  28.  
  29. Use the Spark Plug Inspection procedure to verify the integrity of the spark plugs.
  30.  
  31. Remove the suspected ignition coil if it is directly over the spark plug.
  32.  
  33. Install a spark tester to verify the output of the ignition coil in question.
  34.  

 
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