DTC P2440 Secondary Air Injection System Switching Valve Stuck Open (Bank 1): 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 2.5L TURBO (WITHOUT PUSH BUTTON START), WIRING DIAGRAM, Engine Electrical System.>
Engine Electrical System ENGINE TYPE EJ (WITH PUSH BUTTON START) <Ref. to 2.5L TURBO (WITH PUSH BUTTON START), WIRING DIAGRAM, Engine Electrical System.>

Fig 1: Secondary Air Injection System Switching Valve Stuck Open (Bank 1) - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

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 FUSE BOX AND SECONDARY AIR COMBINATION VALVE RH CONNECTOR. Remove the secondary air combination valve fuse (10 A) from the fuse box. Disconnect the connectors from the secondary air combination valve RH and the secondary air combination valve LH. Measure the resistance between the secondary air combination valve fuse, secondary air combination valve RH connector, secondary air combination valve LH connector and the chassis ground. Connector & terminal (F9) No. 5 - Chassis ground: (E41) No. 2 - Chassis ground: (E40) No. 6 - Chassis ground:	Is the resistance 1 MΩ or more?	Replace the fuse with a new part, and connect the secondary air combination valve RH connector and the secondary air combination valve LH connector. Go to step 3.	Repair the short circuit to ground in harness between the fuse box and the secondary air combination valve RH connector and the secondary air combination valve LH connector.
3 CHECK SECONDARY AIR COMBINATION VALVE RH OPERATION. Install the delivery mode fuse. Turn the ignition switch to ON. Perform operation check for the secondary air combination valve RH using the Subaru Select Monitor. NOTE: For detailed procedures, refer to "System Operation Check Mode". <Ref. to SYSTEM OPERATION CHECK MODE .>	Does the secondary air combination valve RH 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 RH. Check the duct between the secondary air pump and secondary air combination valve RH.	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 RH AND CYLINDER HEAD. Check the pipe between the secondary air combination valve RH 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 RH. Disconnect the connector from the secondary air combination valve RH. In the condition of step 3, measure the voltage between secondary air combination valve RH connector and chassis ground. Connector & terminal (E41) No. 2 (+) - Chassis ground (-):	Does the voltage repeatedly change between 10 V and 0 V?	Replace the secondary air combination valve RH. <Ref. to SECONDARY AIR COMBINATION VALVE .>	Go to step 7.
7 CHECK HARNESS BETWEEN SECONDARY AIR COMBINATION VALVE RH AND CHASSIS GROUND. Measure the resistance between the secondary air combination valve RH connector and chassis ground. Connector & terminal (E41) 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 RH connector and chassis ground.
8 CHECK HARNESS BETWEEN SECONDARY AIR COMBINATION VALVE RELAY 2 AND SECONDARY AIR COMBINATION VALVE RH CONNECTOR. Turn the ignition switch to OFF. Remove the secondary air combination valve relay 2 from the relay box. Measure the resistance of the harness between secondary air combination valve relay 2 connector and secondary air combination valve RH connector. Connector & terminal (F9) No. 8 - (E41) 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 RH connector Poor contact of coupling connector
9 CHECK SECONDARY AIR COMBINATION VALVE RELAY 2. Connect the battery to terminals No. 9 and No. 10 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. <Ref. 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. <Ref. 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 connector 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 connector 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?	Go to step 14 .	Repair the short circuit to ground in harness between ECM connector and secondary air combination valve relay 2 connector.
14 CHECK SECONDARY AIR COMBINATION VALVE LH OPERATION. Install the delivery mode fuse. Turn the ignition switch to ON. Perform operation check for the secondary air combination valve LH using the Subaru Select Monitor. NOTE: For detailed procedures, refer to "System Operation Check Mode". <Ref. to SYSTEM OPERATION CHECK MODE .>	Does the secondary air combination valve LH repeatedly switch to ON and OFF?	Go to step 15 .	Go to step 17 .
15 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 16.
16 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.
17 CHECK POWER SUPPLY TO SECONDARY AIR COMBINATION VALVE LH. Disconnect the connector from the secondary air combination valve LH. In the condition of step 14, measure the voltage between secondary air combination valve LH connector and chassis ground. Connector & terminal (E40) No. 6 (+) - Chassis ground (-):	Does the voltage repeatedly change between 10 V and 0 V?	Replace the secondary air combination valve LH. <Ref. to SECONDARY AIR COMBINATION VALVE .>	Go to step 18.
18 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. 4 - Chassis ground:	Is the resistance less than 5 Ω?	Go to step 19 .	Repair the open circuit in harness between secondary air combination valve LH connector and chassis ground.
19 CHECK HARNESS BETWEEN SECONDARY AIR COMBINATION VALVE RELAY 1 AND SECONDARY AIR COMBINATION VALVE LH CONNECTOR. Turn the ignition switch to OFF. Remove the secondary air combination valve relay 1 from the relay box. Measure the resistance of the harness between the secondary air combination valve relay 1 and secondary air combination valve LH connector. Connector & terminal (F9) No. 3 - (E40) No. 6:	Is the resistance less than 1 Ω?	Go to step 20 .	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between secondary air combination valve relay 1 connector and secondary air combination valve LH connector Poor contact of coupling connector
20 CHECK SECONDARY AIR COMBINATION VALVE RELAY 1. Connect the battery to terminals No. 1 and No. 2 of the secondary air combination valve relay 1. Measure the resistance between the secondary air combination valve relay 1 terminals. Terminals No. 3 - No. 4:	Is the resistance less than 1 Ω?	Go to step 21 .	Replace the secondary air combination valve relay 1. <Ref. to ELECTRICAL COMPONENT LOCATION .>
21 CHECK SECONDARY AIR COMBINATION VALVE RELAY 1. Measure the resistance between the secondary air combination valve relay 1 terminals with the battery disconnected. Terminals No. 3 - No. 4:	Is the resistance 1 MΩ or more?	Go to step 22 .	Replace the secondary air combination valve relay 1. <Ref. to ELECTRICAL COMPONENT LOCATION .>
22 CHECK SECONDARY AIR COMBINATION VALVE RELAY 1 POWER SUPPLY. Turn the ignition switch to ON. Measure the voltage between the secondary air combination valve relay 1 connector and chassis ground. Connector & terminal (F9) No. 4 (+) - Chassis ground (-): (F9) No. 1 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Go to step 23 .	Repair the open or ground short circuit of power supply circuit.
23 CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RELAY 1 CONNECTOR. Turn the ignition switch to OFF. Disconnect the ECM connector. Measure the resistance of harness between ECM connector and secondary air combination valve relay 1 connector. Connector & terminal (B135) No. 8 - (F9) No. 2:	Is the resistance less than 1 Ω?	Go to step 24 .	Repair the harness and connector. NOTE: In this case, repair the following item: Open circuit in harness between ECM connector and secondary air combination valve relay 1 connector Poor contact of coupling connector
24 CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RELAY 1 CONNECTOR. Measure the resistance between the secondary air combination valve relay 1 connector and chassis ground. Connector & terminal (F9) No. 2 - 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 connector and secondary air combination valve relay 1 connector.