Challenger V6-3.5L (2009)
Fuel Pressure: Testing and Inspection
Checking the Fuel Delivery System
CHECKING THE FUEL DELIVERY SYSTEM
For a complete wiring diagram refer to the wiring information See: Diagrams/Electrical Diagrams.
1. CHECKING THE FUEL PUMP OPERATION
1. Turn the ignition on.
NOTE: Diagnose and repair any fuel pump control circuit or relay DTCs before continuing with this test.
2. With a scan tool, actuate the fuel pump control to ON (100%).
NOTE: It may be necessary to use a mechanics stethoscope in the next step.
3. Listen for fuel pump operation at the fuel tank. The fuel pump should operate smoothly, without excessive noise. If necessary, compare to a known
good vehicle of similar year, make, and model.
NOTE: If the pump has excessive noise or grinding, the pump should be replaced.
CAUTION: Stop all actuation tests before continuing.
Is the fuel pump operating when actuated?
Yes
-
Go to 2
No
-
Go to 7
2. CHECKING THE FUEL PRESSURE
1. 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 possible serious or fatal injury.
2. Install a fuel pressure gauge on the fuel rail.
3. Turn the ignition on.
4. With the scan tool, actuate the fuel pump relay control. Observe the fuel pressure gauge.
NOTE: The fuel pressure specification is 407 Kpa +/- 34 Kpa (59 psi +/- 5 psi).
CAUTION: Stop all actuation tests before continuing.
Select the conclusion that best matches the result of the test:
Fuel pressure is within the stated specification
-
Test complete.
Fuel pressure is below the stated specification
-
Go to 3
Fuel pressure is above the stated specification
-
Replace the fuel filter/pressure regulator.
-
Perform the PCM Verification Test. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble
Code Tests and Associated Procedures/Verification Tests/PCM Verification Test
3. RESTRICTED FUEL SUPPLY LINE
1. Turn the ignition off.
