1.CHECK CURRENT DATA.
2) Read the data of tumble generator valve position sensor signal using Subaru Select Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, 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 voltage 4.9 V or more?
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Even if the malfunction indicator light illuminates, the circuit has returned to a normal condition at this time. Temporary poor contact of connector may be the cause.
NOTE:
In this case, repair the following item:
• Poor contact of tumble generator valve position sensor connector
• Poor contact in ECM connector
• Poor contact of coupling connector
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2.CHECK HARNESS BETWEEN TUMBLE GENERATOR VALVE POSITION SENSOR CONNECTOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble generator valve position sensor.
3) Measure the resistance of harness between tumble generator valve position sensor connector and engine ground.
Connector & terminal
(E54) No. 2 — Engine ground:
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Is the resistance less than 5 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit of harness between tumble generator valve position sensor and ECM connector
• Poor contact of coupling connector
• Poor contact of joint connector
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3.CHECK HARNESS BETWEEN TUMBLE GENERATOR VALVE POSITION SENSOR CONNECTOR AND ECM CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between tumble generator valve position sensor connector and engine ground.
Connector & terminal
(E54) No. 3 (+) — Engine ground (−):
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Is the voltage 4.9 V or more?
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Repair the battery short circuit of harness between tumble generator valve position sensor and ECM connector. After repair, replace the ECM.
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Replace the tumble generator valve position sensor.
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