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(P0301) CYLINDER #1 MISFIRE (CONTINUED) 8. CHECKING FUEL LEAK DOWN WARNING: THE FUEL SYSTEM IS UNDER A CONSTANT PRESSURE (EVEN WITH THE ENGINE OFF). Note: Before continuing visually and physically inspect the fuel delivery system for external leaks or dam- Install a substitute fuel pressure hose between the fuel pump and fuel filter. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. Using Special Tool #C4390, Hose Clamp Pliers, slowly clamp off the substitute fuel pressure hose between the fuel Monitor the fuel pressure gauge for a minimum of 5 minutes. Note: The pressure should not fall below 3.0 bar (44 psi) within 5 minutes and should not fall below 2.5 bar Does the fuel pressure gauge fall below the above specification? Yes >> Replace the leaking component between the Fuel Pump and Injector(s). Perform POWERTRAIN VERIFICATION TEST - VER 2. No >> Go To 9 Note: Remove the hose clamp pliers before continuing with test. 9. ENGINE CONTROL RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Fuel Injector harness connector. Note: Check connectors — Clean/repair as necessary. Using a 12-volt test light connected to ground, probe the Engine Con- Does the test light illuminate brightly? Yes >> Go To 10 No >> Repair the Engine Control Relay Output circuit for an open. Perform POWERTRAIN VERIFICATION TEST - VER 2. ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 357 |