1.CHECK CURRENT DATA.
1) Turn the ignition switch to ON.
2) Read the data of secondary air piping pressure signal using Subaru Select Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”. 
• General scan tool
For detailed operation procedures, refer to the general scan tool operation manual.
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Is the measured value less than 53.3 kPa (400 mmHg, 15.8 inHg) ?
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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 may be the cause.
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2.CHECK POWER SUPPLY OF SECONDARY AIR COMBINATION VALVE RH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the secondary air combination valve RH.
3) Turn the ignition switch to ON.
4) Measure the voltage between the secondary air combination valve RH connector and chassis ground.
Connector & terminal
(E41) No. 1 (+) — Chassis ground (−):
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Is the voltage 4.5 V or more?
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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
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3.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of the harness between the ECM and secondary air combination valve RH connector.
Connector & terminal
(B134) No. 27 — (E41) No. 2:
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Is the resistance less than 1 Ω?
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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 coupling connector
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4.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR COMBINATION VALVE RH CONNECTOR.
Measure the resistance between ECM and chassis ground.
Connector & terminal
(B134) No. 27 — Chassis ground:
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Is the resistance 1 MΩ or more?
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Repair the ground short circuit of harness between ECM and secondary air combination valve RH connector.
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5.CHECK POOR CONTACT.
Check for poor contact of ECM and secondary air combination valve RH connector.
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Is there poor contact of ECM or secondary air combination valve RH connector?
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Repair the poor contact of ECM or secondary air combination valve RH connector.
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Replace the secondary air combination valve RH.
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