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Home >> Chrysler >> 2007 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0340 To P050B >> P0462-Fuel Level Sensor 1 Circuit Low >> Diagnostic Test
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnostic Test

  1. 1) FUEL LEVEL SENSOR VOLTAGE BELOW 0.4 OF A VOLT 
    NOTE: Diagnose any CAN - B or CAN -C Communication DTCs before continuing.

    Ignition on, engine not running.

    With the scan tool, read the Fuel Level Sensor voltage.

    Is the Fuel Level Sensor voltage below 0.4 of a volt? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2) FUEL LEVEL SENSOR 

    Turn the ignition off.

    Disconnect the Fuel Pump Module harness connector.

    Ignition on, engine not running.

    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 

    1. Replace the Fuel Level Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  3).
  3. 3) (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 1: Measuring Resistance Between Ground & Fuel Level Signal Circuit
    GC0041669Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C2 Cluster harness connectors.

    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 

    1. Repair the short to ground in the (N4) Fuel Level Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (Z904) FUEL LEVEL SENSOR GROUND CIRCUIT 
    Fig 2: Measuring Resistance Between Fuel Level Signal Circuit & Fuel Level Sensor Ground Circuit
    GC0041671Courtesy of CHRYSLER LLC

    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 

    1. Repair the short between the (Z904) Fuel Level Sensor Ground circuit and the (N4) Fuel Level Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  5).
  5. 5) INSTRUMENT CLUSTER 
    NOTE: Before continuing, check the Instrument Cluster harness connector terminals for corrosion, damage or terminal push out. Repair as necessary.

    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 

    1. Repair as necessary.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace and program the Instrument Cluster per Service Information.
    2. Perform POWERTRAIN VERIFICATION TEST .
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