TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
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Connect VAG1527B 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.
If LED does not light up:
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Check wire connection from terminal 1 to Fuel Pump (FP) relay via fuse for open circuit.
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Repair open circuit if necessary.
If wire connection is OK:
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Check Fuel Pump (FP) relay. See: Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel Pump
(Fp) Relay -J17-, Testing and Activating
If LED lights up:
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Check activation.
Checking activation
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Connect VAG1527B voltage tester to connector terminals 1 (B+) and 2.
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Initiate output DTM and activate Evaporative Emission (EVAP) canister purge regulator valve -N80-. See: Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Manufacturer's Scan Tool
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LED must blink.
If LED does not blink or if it remains constantly lit:
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Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. See: Computers and Control Systems/Testing and Inspection/Scan
Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Wiring and Component Testing Using VAG1598/31
Test Box
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Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:
Harness connector
VAG1598/31 test box