S5 Quattro Coupe V8-4.2L (CAUA) (2009)
Checking internal resistance
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Using a multimeter, check terminals 1 to 2 of the Fuel Injector to be tested for resistance.
Specified value: 12.0 to 20.0 ohms (at approx. 20° C)
If the specified value was not obtained:
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Replace the faulty Fuel Injector.
If the specified value was obtained:
Checking activation
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Connect a diode test lamp (12V) to the Fuel Injector electrical harness connector terminals 1 and 2 of the Fuel Injector to be tested.