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Airflow Inspection

Between intake manifold and vacuum pump

1.Remove the vacuum hose. (See VACUUM HOSE REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)

2.Blow air into the vacuum hose from the vacuum pump side using your mouth and verify that the air flows to the intake manifold side, then blow air from the intake manifold side and verify that the air does not flow to the vacuum pump side.

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• If there is any malfunction of the inner check valve, replace it together with the vacuum hose as a single unit.

Between vacuum pump and power brake unit

1.Remove the vacuum hose. (See VACUUM HOSE REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)

2.Verify that air can be blown from the power brake unit side of the vacuum hose towards the vacuum pump side, and that air cannot be blown in the opposite direction.

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• If there is any malfunction of the inner check valve, replace it together with the vacuum hose as a single unit.