Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

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
  - Go To 2.
  No
  - Go To 5.
    CAUTION:
    Stop All Actuations.
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 Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) 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
  - Go To 3.
  Within Specification
  - Test Complete.
  Above Specification
  - Replace the fuel filter/fuel pressure regulator.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .
    CAUTION:
    Stop All Actuations.
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.
1. Turn the ignition off.
2. Disconnect the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel).
3. Raise the vehicle on a hoist, and disconnect the fuel pressure line at the fuel pump module.
4. Install the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) between the fuel supply line and the fuel pump module.
5. Ignition on, engine not running.
6. 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
  - Repair/replace fuel supply line as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4.
    CAUTION:
    Stop All Actuations.
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 possible serious or fatal injury.
1. Turn the ignition off.
2. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer.
  Is the Fuel Inlet Strainer plugged?
  
  Yes
  - Replace the Fuel Pump Inlet Strainer.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Fuel Pump Module.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST > or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .
(N1) FUEL PUMP RELAY OUTPUT CIRCUIT

Fig 1: Measuring Fuel Pump Relay Output Circuit Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the TIPM C6 harness connector.
3. Disconnect the Fuel Pump Module harness connector.
4. Using a 12-volt test light connected to ground, probe the (N1) Fuel Pump Control Output circuit at the Fuel Pump harness connector.
  NOTE:
  Make sure the test light is probing the circuit before actuating the Fuel Pump or a DTC may set and not allow the actuation.
5. With a scan tool, actuate the Fuel Pump Module.
  Does the test light illuminate brightly during the actuation?
  
  Yes
  - Replace the Fuel Pump Module.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST > or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .
  No
  - Repair the open or short to ground in the (N1 Fuel Pump Control Output circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 1500 & 2500 - 3.7L, 4.7L & 5.7L - POWERTRAIN VERIFICATION TEST > or 3500 CAB & CHASSIS - POWERTRAIN VERIFICATION TEST .