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Home >> Fiat >> 2017 >> 500 Lounge, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 36 (1.4L Turbo - DTCS P0271-00 To P0615-00 - 500) >> DTC Troubleshooting >> P0455-00 EVAP Purge System Large Leak >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. PERFORM A NON-INTRUSIVE LEAK EVALUATION OF THE EVAP SYSTEM 
    NOTE:

    The fuel tank should have less than 95% of fuel tank capacity to properly test the Evap system.

    GC0174926Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition on.
    2. With the scan tool, read the Fuel Tank Pressure (FTP) Sensor value.
    3. Open the system by removing the Gas Cap or using the refueling funnel to open the Capless Fuel Filler.
    4. The Fuel Tank pressure should stabilize at 0 Pa with the system vented to atmosphere. However, there is an offset tolerance allowed in the FTP Sensor  and the reading may not settle exactly on 0 Pa. Consider the value that the sensor settles on when vented to atmosphere as the zero reference  . Adjust the graph by adding or subtracting this value when making your determination of the system.
      NOTE:

      For example: If the FTP Sensor value stabilizes at 27 Pa when vented, adjust the positive side of the graph to +277 Pa and the negative graph to -223 Pa.

    5. Verify that the Fuel Tank pressure has stabilized at zero reference and reinstall the Gas Cap or remove the funnel and reseal the system and monitor the FTP Sensor reading for up to 5 minutes.
    6. Compare your results to the graph above to make a determination of the system.

      What are the results of the leak check?

      Results fall in the grey area on the graph 

      • When a vehicle comes in for repair, the temperature condition of the evaporative system may be very different from the repair area. A rapid temperature change could either conceal a small leak or make a sealed system appear to be leaking. If the pressure curve matches either of the grey areas in the graph above, allow the vehicle to sit inside long enough for the vehicle temperature to stabilize to the surrounding ambient temperature and perform the leak check again.

      Results fall in the green area on the graph 

      • The system is either heating up fast enough to build system pressure up to the ESIM pressure regulation point or cooling down fast enough to create enough vacuum to reach ESIM vacuum regulation point within the specified period of time. This indicates that the system is sealed and not leaking and no attempt at a repair should be performed.

      Results fall in the yellow area on the graph 

      • This would indicate that the system either has a leak, or that the tank temperature has stabilized to a point that it is either not heating up or cooling down fast enough to create enough of a pressure change to make a valid decision.
      • Go To  2
  2. PERFORM AN INTRUSIVE LEAK EVALUATION OF THE EVAP SYSTEM 
    GC0174940Courtesy of CHRYSLER GROUP, LLC
    NOTE:

    Some vehicles may not purge at idle. It may be necessary to command purge with the scan tool or open the throttle to raise the engine speed and allow purging.

    1. Start the engine and wait for purging to begin. Monitor the FTP Sensor to verify purging. Allow the Fuel Tank pressure to stabilize below the ESIM vacuum regulation point.
    2. As soon as the vacuum stabilizes, turn the engine off and monitor the FTP Sensor reading on the scan tool. Monitor the FTP Sensor reading for up to 5 minutes. Remember to apply the zero reference to the graph as determined in the test step above.
      NOTE:

      The vacuum reading should rise quickly to the ESIM vacuum regulation point of approximately -500 Pa (2" H20) +/- the offset, and then stabilize. If the system is sealed, it should not rise above -250 Pa (1" H20) within the specified test time on the graph.

      What are the results of the leak check?

      Results fall in the green area on the graph 

      • This indicates that the system is sealed and not leaking and no attempt at a repair should be performed.

      Results fall in the red area on the graph 

      • This would indicate that the system has a leak.
      • Go To  3
  3. EVAP SYSTEM INSPECTION 
    1. Turn the ignition off.
    2. Perform a visual inspection for:
      • Proper orientation of the ESIM Switch connector (3 O'clock position)
        • If the switch is not in the proper orientation, it may cause the weighted pressure and vacuum vents to intermittently not seal correctly.

      Were any problems found?

      Yes 

      No 

      • Go To  4
  4. EVAPORATIVE EMISSION LEAK DETECTION 
    1. To continue testing you will need the (special tool #8404C, Kit, EELD And Accessory).
    2. Connect the red power lead of the EELD to the Battery positive terminal and the black ground lead to Battery negative terminal.
    3. Connect shop air to the EELD.
    4. Connect the service adapter (special tool #8404-ADP, Smoke Machine Adapters) to the ESIM Switch.
    5. Connect the SMOKE supply tip (black hose) to the adapter.
    6. Set the smoke/air control switch to SMOKE.
      NOTE:

      The flow meter indicator ball will not move in the smoke mode.

    7. Press the remote smoke/air start button.
      NOTE:

      Make sure that smoke has filled the Evap System by continuing to press the remote smoke/air start button, remove the vehicle fuel cap (if applicable) or open the flap (capless), and wait for the smoke to exit. Once smoke is indicated reinstall the fuel cap or close the flap.

      NOTE:

      For optimal performance, introduce smoke into the system for an additional 60 seconds; continue introducing smoke at 15 second intervals, as necessary.

    8. While still holding the remote smoke/air start button, use the white light (special tool #8404-CLL, Light, White) to follow the Evap system path, and look for the source of the leak indicated by exiting smoke.
    9. If a leak is concealed from view (i.e., top of fuel tank), release the remote smoke/air start button, and use the ultraviolet (UV) black light (special tool #8404-UVL, Light, UV) and the yellow goggles (special tool #8404-20, Goggles, Yellow) to look for residual traces of dye that is left behind by the smoke.
    10. The exiting smoke deposits a residual fluid that is either bright green, yellow or purple in color when viewed with a UV light.
      NOTE:

      Carefully inspect the vent side of the Evap Canister. Due to the filtering system in the canister the smoke may not be as thick. Introducing smoke into the filtered side of the canister may assist in locating the leak.

    11. Disconnect the vacuum hose that connects to the Intake Manifold side of the Purge Solenoid and OBD Vent Valve and check for smoke leaking through both components.

      Select the appropriate response from the list below:

      A leak was found at the Fuel Cap (if applicable) or Fuel Filler Tube Assembly; 

      • Perform the appropriate repair by replacing the Fuel Filler Tube Assembly and/or the Fuel Cap (if applicable).
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      A leak was found in the Evap System; 

      • If the leak is at a hose connection, remove the hose then reconnect the hose and check for a leak again. All other leaks, repair as necessary. Verify that the system is not leaking by performing the ESIM Forced Monitor Test again.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No leaks were detected; 

      • Replace the ESIM Switch in accordance with the service information. Verify that the system is not leaking by performing the ESIM Forced Monitor Test again.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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