ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2441 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE STUCK CLOSED (BANK1)

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P2441 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE STUCK CLOSED (BANK1)

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode , and Inspection Mode .

WIRING DIAGRAM:

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?
2.CHECK HARNESS BETWEEN SECONDARY AIR COMBINATION VALVE RELAY CONNECTOR AND SECONDARY AIR COMBINATION VALVE CONNECTOR. 1) Remove the secondary air combination valve fuse (10 A). 2) Remove the secondary air combination valve relay. 3) Disconnect connectors from the secondary air combination valves (LH and RH). 4) Measure the resistance between the secondary air combination valve relay connector and engine ground. Connector & terminal (F9) No. 3 — Engine ground: (F9) No. 4 — Engine ground:	Is the resistance 1 MΩ or more?	Replace the fuse with a new part, connect the secondary air combination valve relay and secondary air combination valve connector, and then go to the next step.	Repair the harness and connector. NOTE: In this case, repair the following item: • Ground short of bus bar between secondary air combination valve fuse (10 A) and secondary air combination valve relay • Short circuit to ground in harness between secondary air combination valve relay connector and secondary air combination valve connector (LH and RH)
3.CHECK SECONDARY AIR COMBINATION VALVE OPERATION. 1) Connect the delivery (test) mode connector. 2) Turn the ignition switch to ON. 3) Perform operation check for the secondary air combination valve using the Subaru Select Monitor. NOTE: Refer to “Compulsory Valve Operation Check” for detailed procedures.	Does the secondary air combination valves repeatedly switch to ON and OFF?
4.CHECK DUCT BETWEEN SECONDARY AIR PUMP AND SECONDARY AIR COMBINATION VALVE. Check the duct between the secondary air pump and secondary air combination valve.	Is there damage, clog or disconnection of the duct?	Replace, clean or connect the duct.
5.CHECK PIPE BETWEEN SECONDARY AIR COMBINATION VALVE AND CYLINDER HEAD. Check the pipe between the secondary air combination valve 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 open or short circuit of harness or temporary poor contact of connector may be the cause.
6.CHECK POWER SUPPLY TO SECONDARY AIR COMBINATION VALVE. 1) Turn the ignition switch to OFF. 2) Disconnect connectors from the secondary air combination valves (LH and RH). 3) In the condition of step 3, measure the voltage between the secondary air combination valve and the chassis ground. Connector & terminal (E40) No. 6 (+) — Chassis ground (−): (E41) No. 2 (+) — Chassis ground (−):	Does the voltage repeatedly change between 10 V and 0 V?
7.CHECK HARNESS BETWEEN SECONDARY AIR COMBINATION VALVE CONNECTOR AND ENGINE GROUND. Measure the resistance between the secondary air combination valve connector and engine ground. Connector & terminal (E40) No. 4 — Engine ground: (E41) No. 1 — Engine ground:	Is the resistance less than 5 Ω?	Replace the secondary air combination valve.	Repair the open circuit of the harness between secondary air combination valve and engine ground.
8.CHECK HARNESS BETWEEN SECONDARY AIR COMBINATION VALVE RELAY CONNECTOR AND SECONDARY AIR COMBINATION VALVE CONNECTOR. 1) Remove the secondary air combination valve relay from the relay box. 2) Measure resistance between the secondary air combination valve relay and secondary air combination valve connector. Connector & terminal (F9) No. 3 — (E40) No. 6: (F9) No. 3 — (E4) No. 2:	Is the resistance less than 1 Ω?		Repair the harness and connector. NOTE: In this case, repair the following item: • Open circuit in harness between the secondary air combination valve relay and secondary air combination valve connector • Poor contact of coupling connector
9.CHECK SECONDARY AIR COMBINATION VALVE RELAY. 1) Connect the battery to terminals No. 1 and No. 2 of secondary air combination valve relay. 2) Measure the resistance between the secondary air combination valve relays. Terminals No. 3 — No. 4:	Is the resistance less than 1 Ω?		Replace the secondary air combination valve relay.
10.CHECK SECONDARY AIR COMBINATION VALVE RELAY. Measure the resistance between the secondary air combination valve relays with the battery disconnected. Terminals No. 3 — No. 4:	Is the resistance 1 MΩ or more?		Replace the secondary air combination valve relay.
11.CHECK SECONDARY AIR COMBINATION VALVE RELAY POWER SUPPLY. 1) Turn the ignition switch to ON. 2) Measure the voltage between the secondary air combination valve relay connector and chassis ground. Connector & terminal (F9) No. 1 (+) — Chassis ground (−): (F9) No. 4 (+) — Chassis ground (−):	Is the voltage 10 V or more?		Repair the open or ground short circuit of harness of power supply circuit.
12.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RELAY CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the ECM connector. 3) Measure the resistance of the harness between ECM and secondary air combination valve relay connector. Connector & terminal (B135) No. 24 — (F9) No. 2:	Is the resistance less than 1 Ω?		Repair the open circuit of harness between ECM and secondary air pump relay connector.
13.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RELAY CONNECTOR. Measure the resistance between the secondary air combination valve relay connector and engine 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 and secondary air pump relay connector.