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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 >> P0452-00 EVAP Pressure Switch Stuck Closed >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE CONDITION 
    1. Turn the ignition on.
    2. With a scan tool, read the ESIM Switch Closed state.

      What is the ESIM Switch Closed state?

      True 

      • Go To  3

      False 

      • Go To  2
  2. EVAP SYSTEM INSPECTION 
    1. Turn the ignition off.
    2. Perform a visual inspection of the entire Evaporative Emission System for any of the following conditions:
      • Proper orientation of the ESIM switch wiring 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. The ESIM wiring harness connector should be in the 3 O'clock position.
      • Damaged or missing components
      • Incorrect routing of hoses and tubes
      • Damaged or pinched hoses and tubes
      • Check the wiring harness routing for possible intermittent short to ground of the ESIM wiring

      Were any problems found?

      Yes 

      No 

      • Testing complete. The condition that caused the fault is intermittent and not present at this time.
  3. CHECK FOR A BLOCKAGE OR MECHANICAL ISSUE IN THE OBD VENT VALVE 
    1. Disconnect the purge tube at the OBD Vent Valve.
    2. Turn the ignition on.
    3. With a scan tool, read the ESIM Switch state.

      Does the ESIM Switch Closed state change from TRUE to FALSE when the purge hose was disconnected?

      Yes 

      • Replace the OBD Vent Valve in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. REMOVE AND CHECK FOR A BLOCKAGE IN THE PURGE HOSE BETWEEN THE OBD VENT VALVE AND THE CANISTER 
    1. Remove and inspect the OBD Vent Valve outlet hose and tee for proper routing, installation, damage, kinks or blockages.

      Is the Purge hose/tube restricted?

      Yes 

      • Repair or replace the pinched or blocked purge tube between the OBD Vent Valve and the Canister.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  5. CHECK THE ESIM SWITCH OPERATION 
    1. Disconnect the ESIM harness connector.

      Does the ESIM Switch Closed state change from TRUE to FALSE when the switch is disconnected?

      Yes 

      • Replace the ESIM in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK THE (K108) ESIM SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Check for continuity between ground and the (K108) ESIM Signal circuit at the ESIM harness connector.

      Is there continuity between ground and the (K108) ESIM Signal circuit?

      Yes 

      • Repair the (K108) ESIM Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK FOR A SHORT BETWEEN THE (K108) ESIM SIGNAL CIRCUIT AND THE ESIM GROUND CIRCUIT 
    1. Check for continuity between the (K108) ESIM Signal circuit and the ESIM Ground circuit at the ESIM Switch harness connector.

      Is there continuity between the (K108) ESIM Signal circuit and the ESIM Ground circuit?

      Yes 

      • Repair the short between the (K108) ESIM Signal circuit and the ESIM Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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