HHR L4-2.4L (2010)
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 A and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
3. Test for less than 5 ohms between the low reference circuit terminal B 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.
Important: If the ignition voltage fuse is open, it will be necessary to test the spliced ignition circuits and the components for a short to
ground.
4. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground.
‹› If the test lamp does not illuminate, test the ignition 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, and observe the scan tool Misfire Current Cylinder parameters.
‹› If the misfire transfers with the suspect ignition coil/module, replace as needed.
7. If the circuits test normal, test or replace the spark plug/s.
Component Testing
Use the J 26792 to verify the output of each ignition coil/module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and
Associated Procedures/Verification Tests and Procedures) after completing the diagnostic procedure.
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Ignition Coil Replacement (See: Service and Repair)
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Spark Plug Replacement (See: Spark Plug/Service and Repair)