Diagnostic Test

FUEL LEVEL SENSOR VOLTAGE BELOW 0.4 OF A VOLT
NOTE: Diagnose any CAN - B or CAN -C Communication DTCs before continuing.
1. Ignition on, engine not running.
2. With the scan tool, read the Fuel Level Sensor voltage.
  Is the Fuel Level Sensor voltage below 0.4 of a volt?
  
  Yes
  - Go to step 2
  No
  - Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See INTERMITTENT CONDITION .
  - Perform the POWERTRAIN VERIFICATION TEST. See POWERTRAIN VERIFICATION TEST .
FUEL LEVEL SENSOR
1. Turn the ignition off.
2. Disconnect the Fuel Pump Module harness connector.
3. Ignition on, engine not running.
4. With the scan tool, read the Fuel Level Sensor voltage.
  Did the Fuel Level Sensor voltage change from below 0.4 of a volt to above 4.0 volts?
  
  Yes
  - Replace the Fuel Level Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST. See POWERTRAIN VERIFICATION TEST .
  No
  - Go to step 3
(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

Fig 1: Checking Fuel Level Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the C2 Cluster harness connectors.
3. 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. See POWERTRAIN VERIFICATION TEST .
  No
  - Go to step 4
(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (Z904) FUEL LEVEL SENSOR GROUND CIRCUIT

Fig 2: Checking Fuel Level Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (N4) Fuel Level Signal circuit and the (Z904) Fuel Level Sensor Ground circuit in the Fuel Pump Module harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the short between the (Z904) Fuel Level Sensor Ground circuit and the (N4) Fuel Level Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See POWERTRAIN VERIFICATION TEST .
  No
  - Go to step 5
INSTRUMENT CLUSTER
NOTE: Before continuing, check the Instrument Cluster harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
1. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Instrument Cluster per Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. See POWERTRAIN VERIFICATION TEST .