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P0306-CYLINDER 6 MISFIRE (CONTINUED) 7. FUEL PRESSURE LEAK DOWN NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or dam- WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser- 9 ) or #6631 (3/8 9 ) fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 KPa (35 psi). Does the pressure fall below the listed specification? Yes >> Replace the leaking Fuel Injector(s). Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 8 8. FUEL INJECTOR OPERATION WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser- CAUTION: After each Fuel Injector actuation, start the engine to clean the cylinder of fuel. Failure to do so Start the engine and allow the fuel pressure to reach maximum pressure. Ignition on, engine not running. Using the scan tool, actuate the No.6 Fuel Injector. Monitor the fuel pressure gauge. Does the fuel pressure gauge indicate a drop in fuel pressure? Yes >> Go To 9 No >> Go To 10 NOTE: Turn the ignition off, remove the Fuel Pressure gauge, and connect the fuel lines before continuing. HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 367 |