2007 Compass Patriot MK Factory Service Manual 9 - ENGINE

P0452-EVAP PRESSURE SWITCH STUCK CLOSED





For a complete wiring diagram Refer to Section 8W.



Possible Causes
  
INTERMITTENT DTC
  
EVAP PURGE HOSE/TUBE OBSTRUCTION
  
(K107) ESIM SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
  
(K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO GROUND
  
ESM SWITCH
  
EVAP PURGE SOLENOID
  
POWERTRAIN CONTROL MODULE (PCM)
  

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1. EVAP SYSTEM PRETEST

Ignition on, engine not running.
With a scan tool, select View DTCs. Record the Freeze Frame data if any DTC(s) are present.
Review the vehicle repair history for items related to the current condition.
Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly.
Check for any related technical service bulletins (TSBs) and, if any apply, follow the recommended procedure.

Select the appropriate response from the list below:

A technical service bulletin (TSB) repaired the condition.


A DTC is present, no TSBs apply, or the TSB did not repair the condition.

2. DTC IS ACTIVE

Ignition on, engine not running.
With a scan tool, select Data Display and view the ESIM Switch state.

Is the ESIM Switch state 'Closed'?

Yes


No

3. ESIM SWITCH STATE

With a scan tool, select Data Display and view the ESIM Switch state.
Disconnect the purge hose from the EVAP canister.

Is the ESIM Switch state change from 'Closed' to 'Open' when the purge hose was disconnected?

Yes


No

4. EVAP PURGE HOSE/TUBE OBSTRUCTION

Inspect the Evap Purge hose/tube for proper routing and installation between the EVAP Purge Solenoid and the Fuel Tank and between the Fuel Tank and the Evap Purge Canister.
Make sure the hose/tube is not damaged or kinked and is free from any obstructions or blockage.

Were any problems found?

Yes


No

5. (K52) EVAP PURGE CONTROL CIRCUIT SHORTED TO GROUND



Turn the ignition off.
Disconnect the PCM harness connector.
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. EVAP PURGE SOLENOID

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Evap Purge Solenoid and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes


No

7. ESIM ASSEMBLY

With a scan tool, select Data Display and view the ESIM Switch state.
Disconnect the Evap System Monitor Switch electrical connector.

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

Yes


No

8. (K107) SIGNAL CIRCUIT SHORTED TO GROUND



Turn the ignition off.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K107) ESIM Switch Signal circuit in the ESIM Assembly harness connector.

Is the resistance below 100 ohms?

Yes


No

9. POWERTRAIN CONTROL MODULE (PCM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Evap Purge Solenoid and the Powertrain Control Module (PCM) and between the Evap System Monitor Switch and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes


No