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| Connect one contact of the valve -N156- with the connection line and alligator clip from -V.A.G 1594 A- to the engine mass. |
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| Connect the second contact of the valve - N156- with remote control -V.A.G 1348/3A-, adapter cable -V.A.G 1348/3-2- and connection line to pos. term. |
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| Activate the remote control -V.A.G 1348/3A- for 2 to 3 minutes. During this period, the vacuum unit must be connected. |
| If the vacuum unit does not return to its initial position, check the vacuum unit as follows: |
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| Disconnect vacuum lines from the vacuum unit for variable intake manifold changeover at “T”-union. |
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| Connect hand vacuum pump -V.A.G 1390- to vacuum unit. |
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| Actuate the hand vacuum pump and observe the switch over procedure. |
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| Check vacuum unit for tightness. (The vacuum unit must not return to its initial position as long as it is not ventilated at the hand vacuum pump). |
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| If necessary replace vacuum unit. |
| If the vacuum unit does not connect, test valve -N156- for continuity as follows: |
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| Connect one contact of the valve -N156- with the connection line and alligator clip from -V.A.G 1594 A- to the engine mass. |
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