TT Coupe L4-1.8L Turbo (ATC) (2001)
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Connect multimeter for resistance measurement as follows.
Leak Detective Pump (LDP)
Specified value
-V144- terminals
1+3
640 - 720 Ohms
2+3
15 - 17 Ohms
If specified values are not obtained:
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Replace Leak Detection Pump (LDP) -V144-. See: Service and Repair
If specified values are obtained:
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Check voltage supply at harness connector of Leak Detection Pump (LDP).
Checking voltage supply
NOTE: Voltage supply for the Leak Detection Pump (LDP) runs via the Fuel Pump (FP) relay.
Test requirement
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Fuse for Leak Detection Pump (LDP) OK
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Disconnect connector at Leak Detection Pump (LDP).
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Connect VAG1527B voltage tester as follows:
Electrical harness connector
Measure to
terminal
3
Engine Ground (GND)
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Operate starter briefly.
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LED must light.
If LED does not light:
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Check electrical wire connection from terminal 3 via fuse to Fuel Pump (FP) relay for open circuit.
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Repair open circuit if necessary.