| Checking throttle valve positioner |
| At low engine speeds the vacuum in the intake manifold is not sufficient to ensure correct functioning of the exhaust gas recirculation system. Therefore to increase vacuum the throttle valve remains closed up to 2200 rpm after starting the engine. |
| Special tools and workshop equipment required |
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| Hand multimeter -V.A.G 1526- or multimeter -V.A.G 1715- |
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| Adapter set -V.A.G 1594- |
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| Test box -V.A.G 1598/22- |
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