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HOMESERVICE MANUALSJEEP2008COMPASS LIMITED, FWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDTC U1418, CHECKING FOR INTERMITTENT CONDITION, SYSTEM CHECKS, COMPONENT CHECKS*FUEL PRESSURE LEAK DOWNDIAGNOSTIC TEST
2008 Jeep Compass Limited, FWD, Standard

Diagnostic Test

2008 Jeep Compass Limited, FWD, StandardSECTION Diagnostic Test
  1. FUEL PUMP MODULE 
    NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair / replace as necessary.

    Turn the ignition off.

    WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death.

    Install special tool #6539 (5/16") or #6631 (3/8") 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). If the fuel pressure is not within specification refer to *CHECKING THE FUEL DELIVERY SYSTEM .

    Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine.

    Monitor the fuel pressure gauge for a minimum of 5 minutes.

    NOTE: The pressure should not fall below 241 KPa (35 psi)

    Does the fuel pressure drop? 

    Yes 

    1. Replace Fuel Pump Module.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to step  2.
  2. FUEL INJECTOR(S) 
    WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death.

    Remove special tool #C4390.

    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).

    Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and fuel pump module.

    Monitor the fuel pressure gauge for a minimum of 5 minutes.

    NOTE: The pressure should not fall below 241 KPa (35 psi)

    Does the fuel pressure drop? 

    Yes 

    1. Replace the leaking fuel injectors.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Test Complete.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.