DTC P2442 Secondary Air Injection System Switching Valve Stuck Open (Bank2): 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 SECONDARY AIR COMBINATION VALVE FUSE. Check if the secondary air combination valve fuse (10 A) is blown out.	Is the fuse blown out?	Go to step 2.	Go to step 3.
2 CHECK HARNESS BETWEEN RELAY HOLDER AND SECONDARY AIR COMBINATION VALVE LH CONNECTOR. Remove the secondary air combination valve fuse (10 A) from the relay holder. Disconnect the connector from the secondary air combination valve LH. Measure the resistance between the secondary air combination valve fuse and secondary air combination valve LH connector, and chassis ground. Connector & terminal (F9) No. 5 - Chassis ground: (E40) No. 2 - Chassis ground:	Is the resistance 1 MΩ or more?	Replace the fuse with a new part, and connect the secondary air combination valve LH connector. Go to step 3.	Repair the ground short circuit of harness between relay holder and secondary air combination valve LH connector.
3 CHECK SECONDARY AIR COMBINATION VALVE LH OPERATION. Connect the delivery (test) mode connector. Turn the ignition switch to ON. Perform operation check for the secondary air combination valve LH using the Subaru Select Monitor. NOTE: Refer to "Compulsory Valve Operation Check Mode" for more operation procedures. < Refer to COMPULSORY VALVE OPERATION CHECK MODE . >	Does the secondary air combination valve LH repeatedly switch to ON and OFF?	Go to step 4.	Go to step 6.
4 CHECK DUCT BETWEEN SECONDARY AIR PUMP AND SECONDARY AIR COMBINATION VALVE LH. Check the duct between the secondary air pump and secondary air combination valve LH.	Is there damage, clog or disconnection of the duct?	Replace, clean or connect the duct.	Go to step 5.
5 CHECK PIPE BETWEEN SECONDARY AIR COMBINATION VALVE LH AND CYLINDER HEAD. Check the pipe between the secondary air combination valve LH and cylinder head.	Is there damage, clog or disconnection of the pipe?	Replace, clean or connect the pipe.	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.
6 CHECK POWER SUPPLY TO SECONDARY AIR COMBINATION VALVE LH. Disconnect the connector from the secondary air combination valve LH. In the condition of step 3, measure the voltage between secondary air combination valve LH connector and chassis ground. Connector & terminal (E40) No. 2 (+) - Chassis ground (-):	Does the voltage repeatedly change between 10 V and 0 V?	Replace the secondary air combination valve LH. < Refer to SECONDARY AIR COMBINATION VALVE . >	Go to step 7.
7 CHECK HARNESS BETWEEN SECONDARY AIR COMBINATION VALVE LH AND CHASSIS GROUND. Measure the resistance between the secondary air combination valve LH connector and chassis ground. Connector & terminal (E40) No. 1 - Chassis ground:	Is the resistance less than 5 Ω?	Go to step 8.	Repair the open circuit in harness between secondary air combination valve LH connector and chassis ground.
8 CHECK HARNESS BETWEEN SECONDARY AIR COMBINATION VALVE RELAY 2 AND SECONDARY AIR COMBINATION VALVE LH CONNECTOR. Turn the ignition switch to OFF. Remove the secondary air combination valve relay 2 from the relay holder. Measure the resistance of the harness between the secondary air combination valve relay 2 and secondary air combination valve LH connector. Connector & terminal (F9) No. 8 - (E40) No. 2:	Is the resistance less than 1 Ω?	Go to step 9.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between secondary air combination valve relay 2 connector and secondary air combination valve LH connector Poor contact of coupling connector
9 CHECK SECONDARY AIR COMBINATION VALVE RELAY 2. Connect the battery to terminals No. 10 and No. 9 of the secondary air combination valve relay 2. Measure the resistance between the secondary air combination valve relay 2 terminals. Terminals No. 7 - No. 8:	Is the resistance less than 1 Ω?	Go to step 10.	Replace the secondary air combination valve relay 2. < Refer to ELECTRICAL COMPONENT LOCATION . >
10 CHECK SECONDARY AIR COMBINATION VALVE RELAY 2. Measure the resistance between the secondary air combination valve relay 2 terminals with the battery disconnected. Terminals No. 7 - No. 8:	Is the resistance 1 MΩ or more?	Go to step 11.	Replace the secondary air combination valve relay 2. < Refer to ELECTRICAL COMPONENT LOCATION . >
11 CHECK SECONDARY AIR COMBINATION VALVE RELAY 2 POWER SUPPLY. Turn the ignition switch to ON. Measure the voltage between the secondary air combination valve relay 2 connector and chassis ground. Connector & terminal (F9) No. 7 (+) - Chassis ground (-): (F9) No. 10 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Go to step 12.	Repair the open or ground short circuit of power supply circuit.
12 CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RELAY 2 CONNECTOR. Turn the ignition switch to OFF. Disconnect the ECM connector. Measure the resistance of harness between ECM and secondary air combination valve relay 2 connector. Connector & terminal (B135) No. 20 - (F9) No. 9:	Is the resistance less than 1 Ω?	Go to step 13.	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM and secondary air combination valve relay 2 connector Poor contact of coupling connector
13 CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RELAY 2 CONNECTOR. Measure the resistance between the secondary air combination valve relay 2 connector and chassis ground. Connector & terminal (F9) No. 9 - Chassis ground:	Is the resistance 1 MΩ or more?	Repair the poor contact of ECM connector.	Repair the short circuit to ground in harness between ECM and secondary air combination valve relay 2 connector.