S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
Fuel Injector: Testing and Inspection
Fuel Injectors, Checking
Fuel Injectors, Checking
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Diode test lamp (12V).
‹› Wiring diagram.
Test requirements
‹› The Fuel Injectors (N30, N31, N32, N33, N83, N84, N85, N86) (S116) OK.
‹› The Engine Speed (RPM) Sensor (G28) OK, checking.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
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Observe safety precautions.
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Observe rules for cleanliness.
Procedure
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Remove the engine cover with air filter.
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Disconnect the Fuel Injector electrical harness connectors from Fuel Injectors (N30, N31, N32, N33, N83, N84, N85, N86).
Checking internal resistance
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Using a multimeter, check the Fuel Injector electrical terminals 1 to 2 for resistance.
Specified value: 12.0 to 20.0 ohms (at approx. 20° C)