Grand Cherokee 2WD V6-3.7L (2008)
Above Specification
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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
3. RESTRICTED FUEL SUPPLY LINE
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.
Turn the ignition off.
Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module.
Install special tool #6539 (5/16 inch) or #6631 (3/8 inch)
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 ASD Fuel System test and observe the fuel pressure gauge.
NOTE: Fuel pressure specification is 407 KPa ± 34 KPa (59 psi ± 5 psi).
CAUTION: Stop All Actuations.
Is the fuel pressure within specification now?
Yes
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Repair/replace fuel supply line as necessary.
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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
No
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Go To 4
4. CHECKING FUEL INLET STRAINER
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.
Turn the ignition off.
Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer.
Is the Fuel Inlet Strainer plugged?
Yes
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Replace the Fuel Pump Inlet Strainer.
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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
No
-
Replace the Fuel Pump Module.
-
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
5. (A109) FUEL PUMP RELAY OUTPUT CIRCUIT OPEN
Turn the ignition off.
