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.

CHECK FOR EXTERNAL DAMAGE TO FUEL TANK
1. Visually inspect the fuel tank for external damage.
  Is the fuel tank damaged from the outside?
  
  Yes
  - Replace the Fuel Tank in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 2.
CHECK THE (N4) FUEL LEVEL SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 1: Checking The Fuel Level Sensor Signal Circuit For An Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Turn ignition off.
2. Disconnect the Fuel Pump Module harness connector.
3. Disconnect the TIPM C7 harness connector.
4. Measure the resistance of the (N4) Fuel Level Sensor Signal circuit between the TIPM C7 harness connector and the Fuel Level Sensor harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 3.
  No
  - Repair the (N4) Fuel Level Sensor Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (G109) FUEL LEVEL SENSOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 2: Checking Fuel Level Sensor Return Circuit For An Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance of the (G109) Fuel Level Sensor Return circuit between the TIPM C7 harness connector and the Fuel Pump Module harness connector.
  Is the resistance less than 5.0 Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the (Z210) Fuel Level Sensor Return circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE FUEL LEVEL SENSOR
1. Remove the Fuel Level Sensor from the fuel tank.
  Does the fuel level float arm move freely?
  
  Yes
  - Go To 5.
  No
  - Replace the Fuel Level Sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE FUEL LEVEL SENSOR RESISTANCE

Fig 3: Checking Fuel Level Sensor Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance across the (N4) Fuel Level Sensor Signal circuit and (G109) Fuel Level Sensor Return circuit at the Fuel Level Sensor while moving the sensor float arm up and down.
  Does the resistance read between approximately 20 and 220 Ohms as you move the sensor arm?
  
  Yes
  - Go To 6.
  No
  - Replace the Fuel Level Sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK INSIDE OF FUEL TANK FOR OBSTRUCTION
1. Visually inspect the inside of the fuel tank for obstructions.
  Is the inside of the fuel tank damaged or obstructing the Fuel Level Sensor?
  
  Yes
  - Replace the Fuel Tank in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Test Complete.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .