DTC P0453 EVAP System (CPC) Pressure Sensor/Switch Circuit High: Wiring Diagram

WARNING: This page is about a different variant/trim than selected.

Engine Electrical System ENGINE TYPE EJ (WITHOUT PUSH BUTTON START) Ref. to the appropriate SYSTEM WIRING diagram article. ENGINE TYPE EJ (WITHOUT PUSH BUTTON START).
Engine Electrical System ENGINE TYPE EJ (WITH PUSH BUTTON START) Ref. to the appropriate SYSTEM WIRING diagram article. ENGINE TYPE EJ (WITH PUSH BUTTON START).

Fig 1: Engine Electrical System - Wiring Diagram (Engine Type EJ)
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and the leak check valve assembly. Measure the resistance of harness between ECM connector and the leak check valve assembly connector. Connector & terminal (B136) No. 21 - (R400) No. 7: (B135) No. 30 - (R400) No. 8:	Is the resistance less than 1 Ω?	Go to step 2.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM connector and the leak check valve assembly connector Poor contact of coupling connector Poor contact of joint connector
2 CHECK FOR POOR CONTACT. Check for poor contact of ECM and the leak check valve assembly connector.	Is there poor contact in ECM and the leak check valve assembly connector?	Repair the poor contact of ECM and the leak check valve assembly connector.	Go to step 3.
3 CHECK LEAK CHECK VALVE ASSEMBLY. Check the pressure sensor of the leak check valve assembly. < Ref. to CHECK PRESSURE SENSOR , INSPECTION, Leak Check Valve Assembly. >	Is the pressure sensor of the leak check valve assembly OK?	Repair the short circuit to power in harness between ECM connector and leak check valve assembly connector.	Replace the leak check valve assembly. < Ref. to LEAK CHECK VALVE ASSEMBLY . >