Liberty 4WD V6-3.7L (2009)
1. FUEL PUMP OPERATION
1. Ignition on, engine not running.
2. With a scan tool, actuate the Fuel System test.
NOTE: It may be necessary to use a mechanics stethoscope in the next step.
3. Listen for fuel pump operation at the fuel tank.
Does the Fuel Pump operate?
Yes
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Go To 2
No
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Go To 5 CAUTION: Stop All Actuations.
2. FUEL PRESSURE
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 possible serious or fatal injury.
1. Turn the ignition off.
2. Install a fuel pressure gauge at the engine.
3. Ignition on, engine not running.
4. 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).
Choose a conclusion that best matches your fuel pressure reading.
Below Specification
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Go To 3
Within Specification
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Check for contamination/water in the fuel. Make sure the fuel being used in this vehicle meets manufactures Fuel Requirement.
Above Specification
-
Replace the fuel filter/fuel pressure regulator.
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Perform the POWERTRAIN VERIFICATION TEST. See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests/Powertrain Verification Test. CAUTION: Stop All
Actuations.
3. RESTRICTED FUEL SUPPLY LINE
