audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel Injection Volume, Leakage and Spray Pattern Check|Page 10574 > < Fuel Injection Volume, Leakage and Spray Pattern Check|Page 10572
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Fuel Injector: Testing and Inspection
Fuel Injectors, Checking

Fuel injectors, checking

Electrical testing of fuel injectors

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Disconnect harness connector from injector to be tested.

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Connect multimeter to fuel injector (resistance measurement range).
Specification: 13 to 16 ohms

NOTE:  When the engine is at operating temperature the electrical resistance of the injectors will be about 4 to 6 ohms higher.

If the specification is not obtained:

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Replace fuel injector.

If specification is met:

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Check voltage supply.

Checking voltage supply

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Disconnect harness connector from fuel injector to be tested.

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Connect diode test lamp (for measuring voltage) between Ground (GND) and socket 1 of connector.

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Operate starter for a few seconds (the engine can be allowed to start).
Specification: The diode test lamp should light up.

If the diode test lamp lights up:

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Check wiring connections. 

If the diode test lamp does not light up:

Fuel Injection Volume, Leakage and Spray Pattern Check|Page 10574 > < Fuel Injection Volume, Leakage and Spray Pattern Check|Page 10572