Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
Diagnose and repair any communication DTCs before continuing with this test.

NOTE:
Diagnose P0462 or P0463 first, if set along with P0461.
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. With the scan tool, select View DTCs.
  NOTE:
  It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.
  
  Is the DTC Active or Pending at this time?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
VISUALLY INSPECT FUEL TANK
1. Visually inspect the Fuel Tank for damage that may restrict the Fuel Sending Unit float from moving.
  Is the Fuel Tank OK?
  
  Yes
  - Go To 3.
  No
  - Replace the Fuel Tank as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(N4) FUEL LEVEL SIGNAL CIRCUIT OPEN

Fig 1: Measuring Resistance Of Fuel Level Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Fuel Pump Module harness connector.
3. Disconnect the C7 Totally Integrated Power Module (TIPM) harness connector.
4. Measure the resistance of the (N4) Fuel Level Signal circuit from the Fuel Pump Module harness connector to the C7 TIPM harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the open in the (N4) Fuel Level Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

Fig 2: Measuring Resistance Between Ground And Fuel Level Signal Circuit In Fuel Pump Module Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (N4) Fuel Level Signal circuit in the Fuel Pump Module harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short to ground in the (N4) Fuel Level Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5.
(G109) GROUND CIRCUIT OPEN

Fig 3: Measuring Resistance Of Ground Circuit From Fuel Pump Module Harness Connector To TIPM Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (G109) Ground circuit from the Fuel Pump Module harness connector to the C7 TIPM harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the open in the (G109) Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
INTERNAL INSPECTION OF THE FUEL TANK
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. Remove the Fuel Tank in accordance with the Service Information.
2. Remove the Fuel Pump Module.
3. Visually inspect the inside of the Fuel Tank for any obstructions or deformities.
4. Inspect the Fuel Pump Module Float arm for damage.
  Were any problems found?
  
  Yes
  - Repair or replace as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7.
FUEL LEVEL SENSOR
If there are no possible causes remaining, view repair.

Repair
- Verify that there is good pin to terminal contact at the Fuel Pump Module and the Powertrain Control Module connectors. Replace the Fuel Level Sensor if no problems were found at the connectors.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .