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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 3.6L - DTCS P0157 To P0457 >> Diagnosis And Testing >> P0452-EVAP Pressure Switch Stuck Closed >> Diagnostic Test

Diagnostic Test

  1. VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION 
    1. Ignition on, engine not running.
    2. With the scan tool, select View DTCs and record the related Freeze Frame data if any DTCs are present.
    3. Whether or not any DTCs are Active you will want to check the following items which may assist in repairing the customer's complaint successfully:
      • Check the vehicle's repair history.
      • If the vehicle has a repair history that pertains to the customer's current complaint, review the repair.
      • Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly.
      • Check for any service bulletin(s) related to the customer's complaint or DTCs.
      • If a service bulletin applies, follow the instructions of the service bulletin.

      Choose the following scenario that best applies.

      The service bulletin repaired the customer's complaint. 

      • Testing complete.

      A DTC is present, no service bulletins apply or the service bulletin didn't repair the customer's complaint. 

      • Go To  2
  2. ACTIVE DTC 
    NOTE:

    If the customer is experiencing an early fuel shut off during the fuel filling process along with P0440, P0441 and P0452 setting, you need to check for restrictions in the Evaporative Purge tubes/hoses as well as the Fresh Air Filter before continuing.

    1. With the scan tool, perform the ESIM FORCED MONITOR TEST. Allow the test to complete.
    2. With the scan tool, select View DTCs.

      Is the DTC Active or Pending at this time?

      Yes 

      • Go To  3

      No 

  3. ESIM SWITCH STATE 
    1. With the scan tool, select Data Display and view the ESIM Switch state.
    2. Remove the gas cap.

      Does the ESIM Switch state change from 'Closed' to 'Open' when the gas cap was removed?

      Yes 

      • Go To  4

      No 

      • Go To  7
  4. EVAP PURGE HOSE/TUBE AND FRESH AIR FILTER OBSTRUCTION 
    1. Turn the ignition off.
    2. Inspect the Evaporative Purge hose/tube for proper routing and installation between the Evap Purge Solenoid and the Fuel Tank and between the Fuel Tank and the Evaporative Purge Canister.
    3. Make sure the hose/tube and fresh air filter are not damaged, kinked and free from any obstructions.
    4. Check for any kink in the purge line connecting the LPV (Linear Purge Valve) to intake manifold.

      Were any problems found?

      Yes 

      No 

      • Go To  5
  5. (K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 1: Checking EVAP Purge Control Circuit For Short To Ground
    GC0090824Courtesy of CHRYSLER GROUP, LLC
    1. Disconnect the PCM harness connectors.
    2. Measure the resistance between ground and the (K52) Evap Purge Control circuit in the Evap Purge Solenoid harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the short to ground in the (K52) Evap Purge Control circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  6
  6. EVAP PURGE SOLENOID 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Evap Purge Solenoid and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Evap Solenoid and the Powertrain Control Module connectors.
    4. Perform any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

  7. ESIM SWITCH 
    1. Using the scan tool, select Data Display and view the ESIM Switch state.
    2. Disconnect the ESIM Switch electrical connector.

      Does the ESIM Switch state change from CLOSED to OPEN when the switch is disconnected?

      Yes 

      • Verify that there is good pin to terminal contact in the switch and the Powertrain Control Module connectors. Replace the ESIM Switch if no problems were found with the connectors.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. (K107) ESIM SWITCH SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking ESIM Signal Circuit For Short To Ground
    GC0090828Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the PCM harness connector.
    3. Measure the resistance between ground and the (K107) ESIM Switch Signal circuit in the ESIM Switch harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Repair the short to ground in the (K107) ESIM Switch Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  9
  9. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Evap Purge Solenoid Assembly, ESIM Switch and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the ESIM, Evap Purge Solenoid and the Powertrain Control Module connectors.
    4. Perform any Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

      • Replace and program the Powertrain Control Module in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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