G6 2005-2007

Diagnosis & Testing

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Understand and Verify the Customers Concern. The first part of this step is to obtain as much information as possible from the customer. Are there aftermarket accessories on the vehicle- When does the condition occur- Where does the condition occur- How long does the condition last- How often does the condition occur- In order to verify the concern, the technician should be familiar with the normal operation of the system.

  1. The following preliminary inspections/tests must be performed:
    1. Ensure that the battery is fully charged.
    2.  
    3. Ensure that the battery cables are clean and tight.
    4.  
    5. Inspect for any open fuses.
    6.  
    7. Ensure that the grounds are clean, tight, and in the correct location.
    8.  
    9. Inspect for aftermarket devices that could affect the operation of the system.
    10.  
    11. Search for applicable service bulletins.
    12.  

  2.  
  3. With the ignition OFF, remove the fuel pump relay to disable fuel supply.
  4.  
  5. Crank the engine and test for a spark on each cylinder spark plug wire using a spark tester tool.
  6.  
  7. Ground the companion cylinder spark plug wire of each cylinder when it is tested.
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  9. 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.
  10.  
  11. The wire circuit resistance should measure less than 3 ohms.
  12.  
  13. 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.
  14.  
  15. Check ICM operation.
  16.  

 
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