TT Coupe L4-1.8L Turbo (ATC) (2001)
Checking voltage supply
Test conditions
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Fuel Pump (FP) OK, checking. See: Fuel Pump/Fuel Pump Relay/Testing and Inspection
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Fuse for fuel injectors OK.
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Disconnect connector at the injector to be tested.
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Connect VAG 1527B voltage tester as follows:
Harness connector terminal
Measure to
1
Engine Ground
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Operate starter briefly (engine can also start).
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LED must light.
If LED does not light:
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Check wire connection between terminals 1 and fuse for injector valves for open circuit.
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Repair open circuit if necessary.
If LED lights:
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Check activation of fuel injectors.
Checking activation
Test requirement
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Internal resistance of injector OK:
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Slide back rubber grommet of fuel injector connector, but leave connector connected.
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Connect VAG 1527B 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 between activation's by the ECM, but rather continue to glow and then get slightly brighter during
activation.