Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR OTHER DTCS
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.
1. Turn the ignition on.
2. With the scan tool, read DTCs and record on the repair order.
  Are there any purge system or purge solenoid circuit DTCs active or pending, or is the customer experiencing early fuel shutoff during fueling?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to 3.2L - DIAGNOSTIC CODE INDEX .
  No
  - Go To 2
CHECK THE ESIM SWITCH STATE
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 4
VISUALLY INSPECT THE EVAP SYSTEM
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
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
  No
  - Testing complete. The condition that caused the fault is intermittent and not present at this time.
CHECK FOR AN ACTIVE CONDITION
1. Disconnect the purge hose at the Purge Solenoid (canister side).
  NOTE:
  Be sure to disconnect the hose coming from the Evap Canister.
2. Turn the ignition on.
3. With a scan tool, read the ESIM Switch Closed state.
  Does the ESIM Switch Closed state change from TRUE to FALSE when the purge hose was disconnected?
  
  Yes
  - Go To 5
  No
  - Go To 7
CHECK THE EVAP PURGE SOLENOID FOR PROPER OPERATION
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 the vacuum hoses at the 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 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 6
  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. Refer to VALVE, PURGE CONTROL, REMOVAL, 3.2L .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
CHECK THE EVAP PURGE HOSE/TUBE FOR AN OBSTRUCTION
1. Turn the ignition off.
2. Remove and inspect the Evap 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
  - Repair or replace as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
  No
  - Testing complete. The condition that caused the fault is intermittent and not present at this time.
CHECK FOR A BLOCKAGE BETWEEN THE PURGE SOLENOID AND THE CANISTER
1. With a scan tool, read the ESIM Switch Closed state.
2. Remove the Fuel Cap or open the Capless Fuel Filler flap.
  Does the ESIM Switch Closed state change from TRUE to FALSE?
  
  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, 3.2L .
  No
  - Go To 8
CHECK THE ESIM SWITCH FOR PROPER 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, 3.2L .
  No
  - Go To 9
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, 3.2L .
  No
  - Go To 10
CHECK FOR A SHORT BETWEEN THE (K108) ESIM SIGNAL CIRCUIT AND THE (K914) SENSOR GROUND CIRCUIT
1. Check for continuity between the (K108) ESIM Signal circuit and the (K914) Sensor Ground circuit at the ESIM Switch harness connector.
  Is there continuity between the (K108) ESIM Signal circuit and the (K914) Sensor Ground circuit?
  
  Yes
  - Repair the short between the (K108) ESIM Signal circuit and the (K914) Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
  No
  - Go To 11
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all PCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. 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.
5. Connect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
10. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL, 2.4L/3.2L .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .