A8L Quattro Sedan V8-4.2L (AKB) (2002)
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.