TT Quattro Coupe V6-3.2L (BHE) (2005)
Checking voltage supply
NOTE: The voltage for the Leak Detection Pump (LDP) -V144- is supplied by the Fuel Pump (FP) Relay J17.
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Using a Multimeter, check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 for voltage.
Leak Detection Pump (LDP)
Measure to
-V144= electrical harness
connector terminals
3
Engine Ground (GND)
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Operate the starter briefly.
Specified value: battery voltage.
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Switch the ignition off.
If the specified value was not obtained:
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Using a Multimeter, check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 to the Fuel Pump (FP) Relay J17
socket 19/86 for resistance.
Specified value: 1.5 Ohms max
If the specification was not obtained:
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Check the wiring for a short circuit to Battery positive (+) or an open circuit.
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply was OK:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box VAG1598/31.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) J220.
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Using a Multimeter, check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 1 to Motronic Engine Control Module