Malibu V6-3.9L (2007)
pressure should stabilize and remain constant.
8. Monitor the J 34730-1A for 1 minute. The fuel pressure should not decrease more than 34 kPa (5 psi).
^
If the fuel pressure decreases more than 34 kPa (5 psi), continue with Circuit/System Testing.
9. Relieve the fuel pressure to 69 kPa (10 psi).
10. Monitor the J 34730-1A for 5 minutes. The fuel pressure should not decrease more than 14 kPa (2 psi).
^
If the fuel pressure decreases more than 14 kPa (2 psi), replace the fuel sender assembly.
11. Remove the J 34730-1A.
12. Operate the vehicle within the conditions to reproduce the original symptoms.
13. Monitor the O2 and the Fuel Trim parameters with a scan tool.
^
If the scan tool parameters indicate a lean condition, inspect for a restricted fuel feed pipe, poor connections at the harness connectors and
ground circuits of the fuel pump, or a faulty fuel sender assembly.
^
If the scan tool parameters do not indicate a lean condition, go to Symptoms - Computers and Control Systems. See: Powertrain
Management/Computers and Control 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. See: Fuel Filter/Fuel Pressure Release/Service and Repair/Fuel Pressure Relief
3. Disconnect the chassis fuel hose from the engine compartment fuel pipe.
4. Install the J 37287 between the chassis fuel hose and the engine compartment fuel pipe.
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 form 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 1 minute.
^
If the fuel pressure remains constant, replace the fuel sender assembly.
^
If the fuel pressure does not remain constant, locate and replace the leaking fuel injectors.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests and Procedures
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Fuel Injector and Fuel Rail Replacement
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Fuel Tank Module Replacement (Sedan) Fuel Tank Module Replacement (Maxx)
