1.CHECK CURRENT DATA.
1) Turn the ignition switch to ON.
2) Read the data of secondary air pipe pressure signal using the 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 procedure, 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 the malfunction indicator light illuminates, 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 of the harness between ECM and secondary air combination valve RH connector.
• Poor contact in ECM connector
• Poor contact in 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 connectors 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 of the harness between ECM and secondary air combination valve RH connector.
• Poor contact in 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 ground short circuit of the harness between ECM and secondary air combination valve RH connector.
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5.CHECK POOR CONTACT.
Check for poor contact in ECM and secondary air combination valve RH connector.
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Is there poor contact in ECM or secondary air combination valve RH connector?
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Repair the poor contact in ECM or secondary air combination valve RH connector.
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Replace the secondary air combination valve RH.
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