S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
Fuel Injector: Testing and Inspection
Fuel Injectors, Checking
Fuel Injectors, Checking
A -
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).
Specified value: 13.5 - 15.5 Ohms
NOTE: When the engine is at operating temperature the electrical resistance of the injectors will be about 4 - 6 Ohms higher.
If the specification is not obtained:
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Replace fuel injector.
Checking voltage supply
Test conditions
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Fuse for injectors OK
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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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Switch ignition on. The diode test lamp should light up.
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If diode test lamp does not light up, test for open circuits in wiring between contact 1 and fuse for injectors. If necessary, rectify open circuit.
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If diode test lamp lights up, test activation of injectors.
C -
Testing activation of injectors