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HOMESERVICE MANUALSJEEP2008COMPASS SPORT, 2.4 W, FWD, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMDTC U1418, CHECKING FOR INTERMITTENT CONDITION, SYSTEM CHECKS, COMPONENT CHECKS*HARD START (FUEL SYSTEM)DIAGNOSTIC TEST
2008 Jeep Compass Sport, 2.4 W, FWD, Standard

Diagnostic Test

2008 Jeep Compass Sport, 2.4 W, FWD, StandardSECTION 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 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 a fuel pressure gauge at the engine.

    Ignition on, engine not running.

    With a scan tool, actuate the Fuel Pump 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 

    1. Go to step  2.

    Within Specification 

    1. Go to step  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 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.

    Raise vehicle on hoist, and disconnect the fuel supply line at the fuel pump module.

    Install special tool #6539 (5/16") #6631(3/8") 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 Fuel Pump 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 

    1. Visually and physically inspect the fuel supply lines between the fuel tank and the fuel rail. Repair/replace as necessary.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to step  3.
  3. CHECKING THE FUEL PUMP INLET 

    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.

    Remove the Fuel Pump Module and Fuel Tank Module (if equipped), inspect the Fuel Pump Inlet and the bottom of the fuel tank for debris that could cause the fuel pump inlet to be plugged.

    Is the Fuel Inlet Strainer plugged? 

    Yes 

    1. Repair/Replace as necessary.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Replace the Fuel Pump Module.
    2. Perform PCM VERIFICATION TEST .
  4. 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).

    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 below 241 KPa (35 psi)? 

    Yes 

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

    No 

    1. Go to step  5.
  5. 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 below 241 KPa (35 psi)? 

    Yes 

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

    No 

    1. Check the fuel for contaminants.
    2. Perform PCM VERIFICATION TEST .
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.