audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Injection Quantity, Leakage and Spray Pattern, Checking|Page 6007 > < Injection Quantity, Leakage and Spray Pattern, Checking|Page 6005
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Fuel Injector: Testing and Inspection
Injectors, Checking

Injectors, Checking 

NOTE:  To gain access to the injector connectors, the engine cover and air cleaner housing must be removed.

Electrical check on injectors 

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Disconnect connector at injector to be checked.

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Connect portable multimeter to injector for resistance measurement.
Specification: 13...16 Ohm 

NOTE:  With warm engine, injector resistance increases by approx. 4...6 Ohm.

If reading does not match specification:

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Replace injector.

If reading matches specification:

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Check power supply.

Checking power supply 

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Disconnect connector at injector to be checked.

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Connect diode test lamp for voltage measurement to socket 1 of connector and Ground.

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Operate starter for several seconds (engine may start).
Specification: Diode test lamp must light

If diode test lamp lights:

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Check wiring.

If diode test lamp does not light:

Injection Quantity, Leakage and Spray Pattern, Checking|Page 6007 > < Injection Quantity, Leakage and Spray Pattern, Checking|Page 6005