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P0171-FUEL SYSTEM 1/1 LEAN (CONTINUED) 12. RESTRICTED FUEL SUPPLY LINE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser- Install special 5/16 fuel line adapter tool #6539 between disconnected fuel line and the fuel pump module. Attach a fuel pressure test gauge to the T fitting on tool #6539. Ignition on, engine not running. With a scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). CAUTION: Stop All Actuations. Is the fuel pressure within specification? Yes >> Repair or replace fuel supply line as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 13 13. FUEL PUMP INLET STRAINER Turn the ignition off. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser- Is the Fuel Inlet Strainer plugged? Yes >> Replace the Fuel Pump Inlet Strainer. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 14 14. FUEL PUMP MODULE If there are no possible causes remaining, view repair. Repair Replace the Fuel Pump Module. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 234 ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L DR/DH |