2014 Jeep Wrangler JK Factory Service Manual 28 - DTC-Based Diagnostics

P0443-EVAP PURGE SOLENOID CIRCUIT

For a complete wiring diagram, refer to the Wiring Information.



Possible Causes

(K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO VOLTAGE
(K70) EVAP PURGE SOLENOID SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K52) EVAP PURGE SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
EXCESSIVE RESISTANCE IN THE (K52) EVAP PURGE CONTROL CIRCUIT
EXCESSIVE RESISTANCE IN THE (K70) EVAP PURGE SOLENOID SIGNAL CIRCUIT
EVAP PURGE SOLENOID
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).


1. VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION

1. Ignition on, engine not running.
2. With the scan tool, select View DTCs. 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 per the service bulletin.


Choose the following scenario that best applies.

The service bulletin repaired the customer's complaint.


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


2. ACTIVE DTC

1. Ignition on, engine not running.
2. With the scan tool, Select View DTCs.


Is the DTC Active at this time?

Yes


No


3. (K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Evap Purge Solenoid harness connector.
3. Disconnect the PCM harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (K52) Evap Purge Control circuit in the Evap Purge Solenoid harness connector.


Is there any voltage present?

Yes


No


4. (K70) EVAP PURGE RETURN CIRCUIT SHORTED TO VOLTAGE
1. Measure the voltage of the (K70) Evap Purge Return circuit in the Evap Purge Solenoid harness connector.


Is there any voltage present?

Yes


No


5. (K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO GROUND
1. Turn the ignition off.
2. Measure the resistance between ground and the (K52) Evap Purge Control circuit in the Evap Purge Solenoid harness connector.


Is the resistance below 100 Ohms?

Yes


No


6. (K52) EVAP PURGE SOLENOID CONTROL CIRCUIT OPEN

1. Measure the resistance of the (K52) Evap Purge Solenoid Control circuit from the Evap Purge Solenoid harness connector to the appropriate terminal of PCM harness connector .


Is the resistance below 5.0 Ohms?

Yes


No


7. (K70) EVAP PURGE SOLENOID SIGNAL CIRCUIT OPEN

1. Measure the resistance of the (K70) Evap Purge Solenoid Signal circuit from the Evap Purge Solenoid harness connector to the appropriate terminal of PCM harness connector.


Is the resistance below 5.0 Ohms?

Yes


No


8. EVAP PURGE SOLENOID
1. Connect the PCM harness connector.
2. Ignition on, engine not running.
3. Using a 12-volt test light connected to ground, check the (K52) Evap Purge Control circuit in the Evap Purge Solenoid harness connector.
4. With the scan tool, actuate the Evap Purge Solenoid control to the ON (100%) position.


NOTE: The DTC needs to be cleared before actuating the Purge Solenoid, if the DTC is not cleared, the Solenoid may not be allowed to actuate.

NOTE: The test light should be illuminated and bright proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100% actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25% actuation, the brightness should be 25% as bright as a direct connection to the battery.


Does the test light illuminate accordingly during the actuation?

Yes


No


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 Switch, Solenoid and the Powertrain Control Module harness connectors.
4. Perform any Technical Service Bulletins that may apply.


Were there any problems found?

Yes


No