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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (3.6L - DTCS P0158 To P0462) >> DTC Troubleshooting >> P0452-EVAP Pressure Switch Stuck Closed >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Dodge Journey and 2015 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
  1. ESIM SWITCH STATE 
    NOTE:

    If the customer is experiencing an early fuel shut off during the fuel filling process in addition to DTC P0440, P0441, or P0452, check for restrictions in the tubes/hoses between the Fuel tank and Evaporative Canister, ESIM, and the ESIM Vent Filter before continuing.

    NOTE:

    Diagnose and repair any purge system or purge solenoid circuit DTCs before continuing with this test procedure.

    1. Turn the ignition on.
    2. With a scan tool, read the ESIM Switch state.

      What is the state of the ESIM Switch?

      Open 

      • Go To  2

      Closed 

      • Go To  3
  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 AN ACTIVE CONDITION 
    1. Disconnect the Purge Tube at the outlet of the Purge Solenoid.
      NOTE:

      Be sure to disconnect the hose coming from the Evap Canister.

    2. With a scan tool, read the ESIM Switch state.

      Does the ESIM Switch state change from CLOSED to OPEN when the purge hose was disconnected?

      Yes 

      • Go To  4

      No 

      • Go To  6
  4. EVAP PURGE SOLENOID 
    WARNING:

    Keep lit cigarettes, sparks, flames, and other ignition sources away from the test area to prevent the ignition of explosive gases. Keep the test area well ventilated. Failure to do so may result in possible serious or fatal injury.

    1. Disconnect both vacuum hoses at the Evap Purge Solenoid.
      NOTE:

      After disconnecting the Purge Solenoid vacuum connections, inspect the lines and solenoid for signs of contamination.

    2. Using a hand vacuum pump, apply 5 in. Hg. to the "ENGINE" side of the Purge Solenoid.
      NOTE:

      The Purge Solenoid should hold vacuum for a minimum of 15 seconds.

    3. Start the engine.
    4. With the scan tool, navigate to system test, and start the Purge Vapors System test. Select open to actuate the Purge Solenoid to the ON position.
      NOTE:

      The vacuum should drop when the solenoid is actuated.

      Does the solenoid function as described above?

      Yes 

      • Go To  5

      No 

      • Verify that there is good pin to terminal contact in the solenoid and PCM harness connectors. Replace the Purge Solenoid if no problems were found in the connectors.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .
  5. EVAP PURGE HOSE/TUBE OBSTRUCTION 
    1. Turn the ignition off.
    2. Remove and inspect the Purge hose between the Purge Solenoid and the Intake Manifold for proper routing, installation, damage, kinks or blockages.
    3. Inspect the vacuum port on the manifold for blockages.

      Were any problems found?

      Yes 

      No 

      • Testing complete. The condition that caused the fault is intermittent and not present at this time.
  6. CHECK FOR A BLOCKAGE BETWEEN THE PURGE SOLENOID AND THE CANISTER 
    1. With a scan tool, read the ESIM Switch state.
    2. Remove the Fuel Cap or open the Capless Fuel Filler flap.

      Does the ESIM Switch state change from CLOSED to OPEN?

      Yes 

      • Repair the pinched or blocked line between the Purge Solenoid and the Canister or between the Canister and the Fuel Tank.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .

      No 

      • Go To  7
  7. ESIM SWITCH 
    1. Disconnect the ESIM harness connector.

      Does the ESIM Switch state change from CLOSED to OPEN 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  8
  8. 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  9
  9. CHECK FOR A SHORT BETWEEN THE (K108) ESIM SIGNAL CIRCUIT AND THE (Z924) ESIM GROUND CIRCUIT 
    1. Check for continuity between the (K108) ESIM Signal circuit and the (Z924) ESIM Ground circuit at the ESIM Switch harness connector.

      Is there continuity between the (K108) ESIM Signal circuit and the (Z924) ESIM Ground circuit?

      Yes 

      • Repair the short between the (K108) ESIM Signal circuit and the (Z924) ESIM Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST . .

      No 

      • Go To  10
  10. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the ESIM Switch and the PCM.
    2. Look for any chafed, pierced, pinched, or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Perform any Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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