audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Fuel Injector Volume, Leakage & Spray Pattern, Checking|Page 2456 > < Fuel Injector Volume, Leakage & Spray Pattern, Checking|Page 2454
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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 hand-held 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 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.

Fuel Injector Volume, Leakage & Spray Pattern, Checking|Page 2456 > < Fuel Injector Volume, Leakage & Spray Pattern, Checking|Page 2454