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*HARD START FUEL SYSTEM For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. Possible Causes FUEL CONTAMINATION RESTRICTED FUEL SUPPLY LINE FUEL PUMP INLET STRAINER PLUGGED FUEL PUMP MODULE FAULTY FUEL PUMP MODULE FUEL INJECTOR(S) Diagnostic Test 1. CHECKING FUEL PRESSURE Turn the ignition off. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser- 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). Choose a conclusion that best matches your fuel pressure reading. Below Specification Go To 2 Within Specification Go To 4 2. RESTRICTED FUEL SUPPLY LINE Turn the ignition off. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser- Install special tool #6539 (5/16 9 ) #6631(3/8 9 ) fuel line adapter and the fuel pressure gauge between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the 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). Is the fuel pressure within specification? Yes >> Visually and physically inspect the fuel supply lines between the fuel tank and the fuel rail. Repair/re- place as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 3 9 - 1016 ENGINE ELECTRICAL DIAGNOSTICS LX |