| Checking injection quantity and spray pattern of injectors; checking for leaks |
Note | –
| Remove fuel rail (with injectors fitted) from intake manifold → Chapter. Fuel hoses remain connected. |
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| Connect adapter cable -V.A.G 1598/13- to wiring harness for engine control unit. Do not connect engine control unit → Chapter. |
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| Use leads from adapter set -V.A.G 1594C- to bridge contacts 1 and 65 at test box. |
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| The fuel pump should run. |
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| Check injectors for leaks (visual check). When the fuel pump is running, no more than 1 to 2 drops a minute should escape from any one of the injectors. |
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| If the fuel loss is greater, switch off the fuel pump (i.e. switch off the ignition) and renew the faulty injector → Chapter. |
| Checking injection quantity |
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| Place the injector which is to be tested into measuring glass of injection rate tester -V.A.G 1602-. |
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| Connect one of the injector contacts to engine earth using test lead and crocodile clip from auxiliary measuring set -V.A.G 1594C-. |
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| Connect second injector contact to positive using remote control -V.A.G 1348/3A-, adapter cable -V.A.G 1348/3-2- and auxiliary lead. |
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| Use leads from adapter set -V.A.G 1594C- to bridge contacts 1 and 65 at test box. |
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| The fuel pump should run. |
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| Activate remote control -V.A.G 1348/3A- for 30 seconds. |
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| Perform measurements on all injectors. |
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| Once all four injectors have been actuated, place measuring glasses on a level surface. |
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| Specification for each injector: 135 ± 10 ml |
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| If the measured value of one or more injectors is outside the specification, shut off the fuel pump (switch off ignition) and renew the defective injector → Chapter. |
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| If the measured values for all the injectors are outside the specification, check the fuel pressure → Chapter. |
Note | When checking the injection quantity, also check the spray pattern. The spray pattern should be the same for all injectors. |
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| Install injectors together with fuel rail → Chapter. |
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