Dakota 4WD V8-4.7L Flex Fuel (2008)
Diagnostic Test
1. FUEL PUMP OPERATION
Ignition on, engine not running.
With a scan tool, actuate the Fuel System test.
NOTE: It may be necessary to use a mechanics stethoscope in the next step.
Listen for fuel pump operation at the fuel tank.
Does the Fuel Pump operate?
Yes
-
Go To 2
No
-
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 personal injury or death.
Turn the ignition off.
Install a fuel pressure gauge at the engine.
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).
Choose a conclusion that best matches your fuel pressure reading.
Below Specification
-
Go To 3
Within Specification
-
Test Complete.
Above Specification
-
Replace the fuel filter/fuel pressure regulator.
-
Perform the POWERTRAIN VERIFICATION TEST. See: 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
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") or #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 ASD Fuel System test 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 now?
Yes
