S4 V8-4.2L (BHF) (2004)
NOTE: With an engine at operating temperature, the resistance of the fuel injectors increases by approx. 4 to 6 Ohms
If specified value is not obtained:
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Replace fuel injector
If specified value is obtained:
Checking voltage supply
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Connect e.g. V.A.G 1527 B voltage tester as follows:
Harness connector
Measure to
Terminal
1
Engine Ground (GND)
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Operate starter briefly.
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LED must light up.
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Switch ignition off.
If LED does not light up:
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Check wire connection from harness connector terminal 1 to Fuel Pump (FP) Relay -J17- via fuse for open circuit according to wiring diagram.
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Specified value: Wire resistance max 1.5 Ohms
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If necessary, repair wire connection.
If LED lights up:
Checking activation
Test requirement:
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Internal resistance of valve OK
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Slide back rubber grommet of fuel injector connector, but leave connector connected.
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Connect voltage tester e.g. V.A.G 1527 B with measuring probes and connector adapters from V.A.G 1594 A between terminal 2 (signal) and
terminal 1 (B+); the harness connector remains connected.
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Operate starter briefly.
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LED must blink.