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| Connect the diode test lamp between the contacts of the 2-pin plug of the activated charcoal filter system solenoid valve 1 -N80- on the cable harness. |
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| Initiate an actuator diagnosis and select the activated charcoal filter system solenoid valve 1 -N80- → Chapter. |
| The diode test lamp must flash. |
| If the dioden test lamp does not flash or if it remains lit: |
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| Connect the test box - V.A.G 1598/31- or -V.A.G 1598/22 - to the wiring loom of the engine control unit → Chapter. |
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| Test the wire from contact 2 of the plug on the activated charcoal filter system solenoid valve 1 -N80- to the engine control unit for continuity as well as short-circuit to earth or positive according to the current flow diagram → Current flow diagrams and Fitting locations. |
| If there is neither a line interruption nor a short-circuit: |
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