S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Operate the starter and test the activation of the Fuel Injector.
LED should flicker.
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Switch the ignition off.
If LED flickers:
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Replace the faulty Fuel Injector.
If LED does not flicker:
Checking activation and wiring
If the manufacturers test box is being used, perform the following step.
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Install the test box.
If the manufacturers test box is not being used, perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Replacing ] See: Computers and Control
Systems/Engine Control Module/Service and Repair/Engine Control Module, Replacing.
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Using a Multimeter, check the electrical harness connector terminals of the Fuel Injector to be tested to the Motronic Engine Control Module
(ECM) (J623) electrical harness connector T60 terminals for resistance.
Specified value: 1.5 ohms Max.
If the specification is not obtained:
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Check the wiring for an open circuit, a short circuit to each other, Battery (+), or Ground (GND).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
