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| Detach hose from middle connection of exhaust gas recirculation cooler changeover valve -N345--arrow-. |
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| Connect hand vacuum pump -VAS 6213- to the hose which has been removed and generate a vacuum of 0.6 bar. |
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| Watch pressure gauge of hand vacuum pump for approx. 30 seconds. Vacuum must not drop. |
| –
| Detach vacuum hose from vacuum unit for exhaust gas recirculation cooler changeover function. |
| –
| Connect hand vacuum pump -VAS 6213- with supplied vacuum hose to vacuum unit and generate vacuum of 0.6 bar. |
Note | t
| The vacuum unit control range must be perceptible and the vacuum must not drop. If this is not the case, renew the exhaust gas recirculation cooler → Chapter. |
| t
| If no fault can be detected on the vacuum unit, renew the vacuum line from the exhaust gas recirculation cooler changeover valve -N345-. |
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