DTC P2433 Secondary Air Injection System Air Flow/Pressure Sensor Circuit High: Wiring Diagram

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Engine electrical system, turbo model < Refer to appropriate SYSTEM WIRING DIAGRAM. >

Fig 1: Secondary Air Injection System - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK CURRENT DATA. Turn the ignition switch to ON. Read the value of «Sec. Air Piping Pressure » using Subaru Select Monitor. NOTE: For detailed operation procedures, refer to "READ CURRENT DATA FOR ENGINE". < Refer to SUBARU SELECT MONITOR . >	Is the value of «Sec. Air Piping Pressure» 133.3 kPa (1, 000 mmHg, 39.4 inHg) or more?	Go to step 2.	Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
2 CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RH CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from the secondary air combination valve RH. Turn the ignition switch to ON. Read the value of «Sec. Air Piping Pressure » using Subaru Select Monitor. NOTE: For detailed operation procedures, refer to "READ CURRENT DATA FOR ENGINE". < Refer to SUBARU SELECT MONITOR . >	Is the value of «Sec. Air Piping Pressure» 133.3 kPa (1, 000 mmHg, 39.4 inHg) or more?	Repair the short circuit to power in the harness between ECM and secondary air combination valve RH connectors.	Go to step 3.
3 CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RH CONNECTOR. Turn the ignition switch to OFF. Measure the resistance of the harness between the secondary air combination valve RH connector and engine ground. Connector & terminal (E41) No. 3 - Engine ground:	Is the resistance less than 5 Ω?	Go to step 4.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and secondary air combination valve RH connector Poor contact of ECM connector Poor contact of coupling connector
4 CHECK FOR POOR CONTACT. Check for poor contact of secondary air combination valve RH connector.	Is there poor contact of secondary air combination valve RH connector?	Repair the poor contact of secondary air combination valve RH connector.	Replace the secondary air combination valve RH. < Refer to SECONDARY AIR COMBINATION VALVE . >