audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel Injector Leakage, Injection Quantity and Spray Pattern|Page 5119 > < Fuel Injector Leakage, Injection Quantity and Spray Pattern|Page 5117
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Test requirement:

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Internal resistance of valve OK

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Slide back rubber boot 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).
-

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.

If LED does not blink:

-

Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. See: Computers and Control Systems/Testing and Inspection/Scan
Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Wiring and Component Testing Using VAG1598/31
Test Box

-

Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:

-

Repair open circuit or short circuit if necessary.

If wire connection is OK:

Fuel Injector Leakage, Injection Quantity and Spray Pattern|Page 5119 > < Fuel Injector Leakage, Injection Quantity and Spray Pattern|Page 5117