A4 Quattro Sedan L4-1.8L Turbo (AWM) (2001)
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Connect VAG1527B voltage tester as follows:
Harness connector
Measure to
Terminal
1
Engine Ground (GND)
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Switch ignition on.
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LED must light up.
If LED does not light up:
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Check wire connection between terminal 1 and fuse for injector valves for open circuit:
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Repair open circuit if necessary.
If LED lights up:
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Activation of fuel injectors, checking
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 VAG1527B voltage tester between sockets 2 (signal) and 1 (B+).
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Operate starter briefly (engine can also start).
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LED must blink.
NOTE: Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and
then get slightly brighter during activation.