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| Connect vehicle system tester -V.A.G 1552-. Switch ignition on and select address word 01 “Engine electronics” → Chap. 01-1. |
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| Initiate final control diagnosis and drive injector cyl. 1, the fuel pump must run. |
Note | This sequence is intended to ensure that the fuel pump runs when the engine is switched off. The idling speed limit switch must be in closed position as otherwise the selected injector will spray five times. |
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| Test the tightness of the injectors (visual inspection). With the fuel pump running per valve only 1...2 drops of fuel may escape per minute. |
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| If the fuel loss is greater adjust the fuel pump (end final control diagnosis) and replace defective injector. |
Note | Replace seals at the same time. |
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| If necessary repeat final control diagnosis. |
Note | The final control diagnosis can only be initiated again once the ignition has been briefly switched off. |
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