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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 417 (5.7L CNG - DTCS P0204 To P0606 - 2500 Hd) >> Diagnosis And Testing >> P0461-Fuel Level Sensor 1 Performance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 2500 HD and 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. FUEL LEVEL SENSOR CIRCUIT DTCS SET IN THE BCM 
    NOTE:

    Diagnose and repair any CAN BUS, communication or implausible signal DTCs before proceeding with this test.

    NOTE:

    If DTCs P0462 or P0463 are set along with this DTC, diagnose and repair those DTCs before continuing.

    1. Turn the ignition on.
    2. With the scan tool, View BCM DTCs.

      Are any Fuel Level Sensor Circuit DTCs set in the BCM?

      Yes 

      No 

      • Go To  2
  2. 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 

  3. CHECK FOR EXCESSIVE RESISTANCE IN THE (N4) FUEL LEVEL SENSOR SIGNAL 1 CIRCUIT 
    1. Disconnect the Fuel Pump Module harness connector.
    2. Disconnect the BCM C5 harness connector
    3. Measure the resistance of the (N4) Fuel Level Signal 1 circuit between the Fuel Pump Module harness connector and the BCM harness connector

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (N4) Fuel Level Signal 1 circuit for high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  4. CHECK FOR EXCESSIVE RESISTANCE IN THE (G109) FUEL LEVEL SENSOR RETURN CIRCUIT 
    1. Measure the resistance of the (G109) Fuel Level Sensor Return circuit between the Fuel Pump Module harness connector and the BCM harness connector

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (G109) Fuel Level Sensor Return circuit for high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  5. 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. Refer to TANK, FUEL, REMOVAL .
    2. Remove the Fuel Pump Module. Refer to MODULE, FUEL PUMP, REMOVAL .
    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 STANDARD PROCEDURE .

      No 

      • Go To  6
  6. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Body Control Module (BCM) and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Sensor and Powertrain Control Module connectors.
    4. Perform any Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      • Repair as necessary.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

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