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| Connect one contact of the injector to be tested to earth, using the aux. cables of the measuring tool set -VAG 1594C-. |
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| Connect to battery positive the second injector contact with auxiliary cable to remote control -VAG 1348/3A- with the cable -VAG 1348/3-2-. |
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| Bridge contacts 1 + 65 of the tester box, using the cables of the measuring tool set -VAG 1594C-. |
Note | After switching on the ignition, the fuel pump will be working continuously despite the engine being stationary, for the following reason: After switching on the ignition, the fuel pump relay receives positive voltage from the junction box. It receives negative supply through the wiring bridge of the tester box. |
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| Activate remote control -VAG 1348/3A- for 30 seconds. |
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| Repeat check on other injectors. Use new measuring containers for these. |
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| After activating the injectors, place the measuring containers on a flat base and compare injected quantities. |
| Specification per injector: 85 ... 105 ml. |
| If the measured value for one or more of the injectors is outside the tolerance range, switch off the ignition and replace the defective injector. |
| If the measured values for all the injectors are outside the tolerance range, check the fuel system pressure → Chapter. |
Note | When checking the injection quantity, also check the spray pattern. The spray must be equal for all the injectors. |
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| Fit the injectors and fuel rail, observing the following: |
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| Renewing the front O-rings in all open connections, ensuring that the plastic cap is never removed from the injector head. The O-ring must be pulled off over the plastic cap). |
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| The O-rings must be lubricated with a little engine oil. |
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| Insert injectors vertically and in the correct position into the fuel rail and secure with retaining clips. |
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| Fit fuel rail with secured injectors onto intake manifold and press in evenly. |
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