audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel Injectors Injection Quantity/Seal/Spray Pattern, Checking|Page 3485 > < Fuel Injectors Injection Quantity/Seal/Spray Pattern, Checking|Page 3483
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Checking voltage supply

Test conditions

-

Fuel Pump (FP) OK, checking. See: Fuel Pump/Fuel Pump Relay/Testing and Inspection   

-

Fuse for fuel injectors OK.

-

Disconnect connector at the injector to be tested.

-

Connect VAG 1527B voltage tester as follows:

Harness connector terminal

Measure to

1

Engine Ground

-

Operate starter briefly (engine can also start).
-

LED must light.

If LED does not light:

-

Check wire connection between terminals 1 and fuse for injector valves for open circuit.

-

Repair open circuit if necessary.

If LED lights:

-

Check activation of fuel injectors.

Checking activation

Test requirement

-

Internal resistance of injector OK:
-

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

-

Connect VAG 1527B voltage tester between sockets 2 (signal) and 1 (B+).

-

Operate starter briefly (engine can also start).
-

LED must blink.

NOTE:  Voltage testers do not go out completely between activation's by the ECM, but rather continue to glow and then get slightly brighter during
activation.

Fuel Injectors Injection Quantity/Seal/Spray Pattern, Checking|Page 3485 > < Fuel Injectors Injection Quantity/Seal/Spray Pattern, Checking|Page 3483