P0452-EVAP PRESSURE SWITCH STUCK CLOSED

For a complete wiring diagram Refer to Section 8W.

When Monitored:
Immediately after the ignition has been turned off.
Set Condition:
At key off, the PCM energizes the Purge Solenoid for a calibrated amount of time (30 seconds maximum) and stores the state of the ESIM switch. The state is evaluated again at the next key on. If the PCM does not detect that the ESIM switch is open, an error is detected. Two Trip Fault. Three good trips to turn off the MIL.

Possible Causes

EVAP PURGE HOSE/TUBE OBSTRUCTION

(K52) EVAP PURGE SOLENOID CONTROL CIRCUIT SHORTED TO GROUND

(K107) ESIM SWITCH SIGNAL CIRCUIT SHORTED TO GROUND

ESM SWITCH

EVAP PURGE SOLENOID

PCM

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

Diagnostic Test

1.VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION

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

Is the DTC Active at this time?

Yes

Go To 3

Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

3.ESIM SWITCH STATE

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

Yes

Go To 4

Go To 7

4.EVAP PURGE HOSE/TUBE OBSTRUCTION

Were any problems found?

Yes

Replace the Evap Purge Solenoid.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 5

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

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (K52) Evap Purge Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 6

6.EVAP PURGE SOLENOID

Were any problems found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Replace the Evap Purge Solenoid in accordance with the Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

7.ESIM ASSEMBLY

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

Yes

Replace the ESIM Assembly.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 8

8.(K107) ESM SWITCH SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (K107) ESIM Switch Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 9

9.PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Were there any problems found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)