Cobalt L4-2.4L VIN B (2006)
Systems/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Controls
CIRCUIT/SYSTEM TESTING
1. Turn OFF the ignition.
2. Relieve the fuel pressure. Refer to Fuel Pressure Relief Procedure.
3. Disconnect the chassis fuel hose from the fuel rail.
4. Install the J 37287 between the chassis fuel hose and the fuel rail.
5. Open the valve on the J 37287.
6. Turn ON the ignition, with the engine OFF.
7. Command the fuel pump relay ON with a scan tool.
8. Bleed the air from the J 34730-1A.
9. Command the fuel pump relay ON and then OFF with a scan tool.
10. Close the fuel feed pipe shut-off valve.
11. Monitor the J 34730-1A for one minute.
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If the fuel pressure remains constant, replace the fuel pump module.
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If the fuel pressure does not remain constant, locate and replace the leaking fuel injectors.
REPAIR INSTRUCTIONS
IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Fuel Injector Replacement
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Fuel Pump Module Replacement