audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel Injectors, Checking|Page 7012 > < Fuel Injectors, Checking|Page 7010
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Connect VAG1527B voltage tester as follows:

Harness connector

Measure to 

Terminal 

1

Engine Ground (GND)

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Switch ignition on.
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LED must light up.

If LED does not light up:

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Check wire connection between terminal 1 and fuse for injector valves for open circuit:

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Repair open circuit if necessary.

If LED lights up:

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Activation of fuel injectors, checking 

Checking activation

Test requirement:

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Internal resistance of valve Ok

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Slide back rubber grommet of fuel injector connector, but leave connector connected.

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Connect VAG1527B voltage tester between sockets 2 (signal) and 1 (B+).

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Operate starter briefly (engine can also start).
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LED must blink.

NOTE:  Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and
then get slightly brighter during activation.

Fuel Injectors, Checking|Page 7012 > < Fuel Injectors, Checking|Page 7010