| In dead condition the solenoid valve is closed. |
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| Detach hose from activated charcoal filter solenoid valve 1 -N80-. |
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| Connect a suitable manometer and a compressed air device (air pump) to the solenoid valve. |
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| Generate a visible air pressure. |
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| Initiate an actuator diagnosis and select the activated charcoal filter solenoid valve 1 -N80- → Chapter. |
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| When the solenoid valve is opened the displayed air pressure must drop and when it is closed it must clearly rise again, if not replace the solenoid valve. |
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