1.CHECK SECONDARY AIR PIPING PRESSURE.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, read secondary air piping pressure data, and compare with the actual barometric pressure.
NOTE:
For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”. 
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Is the actual difference with barometric pressure 50 mmHg (6.7 kPa, 2.0 inHg, 0.97 psig) or more?
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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 SECONDARY AIR PUMP.
1) Start the engine and warm-up engine until coolant temperature is greater than 75°C (167°F).
2) Check whether the secondary air pump is operating.
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Is the secondary air pump operating?
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Replace the secondary air combination valve RH.
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3.CHECK HARNESS BETWEEN ECM AND SECONDARY AIR PUMP RELAY CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the secondary air pump relay from the relay box.
3) Measure the resistance between secondary air pump relay connector and engine ground.
Connector & terminal
(F9) No. 13 — Engine ground:
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Is the resistance 1 MΩ or more?
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Repair ground short circuit of the harness between the ECM and secondary air pump relay connector.
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4.CHECK SECONDARY AIR PUMP RELAY.
Measure the resistance between secondary air pump relay terminals.
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Is the resistance 1 MΩ or more?
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Repair the short circuit of harness to power supply between secondary air pump relay and secondary air pump connector.
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Replace the secondary air pump relay.
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