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P0300-MULTIPLE CYLINDER MISFIRE (CONTINUED) 12. FUEL SUPPLY LINE RESTRICTED 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 >> 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 >> Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 14. IGNITION WIRE NOTE: If the vehicle being tested does not have an ignition wire answer YES to this test and continue. Remove the ignition wire. Measure the resistance of the ignition wire. Is the resistance below 10K ohms? Yes >> Go To 15 No >> Replace the Ignition Wire. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 320 ENGINE ELECTRICAL DIAGNOSTICS WK |