Jetta L5-2.5L (CBTA) (2008)
NOTE: The voltage for the Leak Detection Pump (LDP) -V144- is supplied via fuse 15 in fuse panel B.
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Check the Leak Detection Pump (LDP) -V144- for voltage.
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Using a multimeter, check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 for voltage. Connect the negative
multimeter lead to engine ground.
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Turn the ignition switch ON.
Specified value: battery voltage.
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Switch the ignition off.
If the specified value was not obtained:
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Remove fuse 23 in fuse panel B. Using a multimeter, check the Leak Detection Pump (LDP) -V144- wiring from terminal 3 to fuse 23 in fuse
panel B.
Specified value: Wire resistance max 1.5 Ohms.
If the specification is not obtained:
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Check the wiring for high resistance 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 or 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.
If the manufacturers test box is not being used, perform the following step.
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Remove the Motronic Engine Control Module (ECM) J623.
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Using a multimeter, check the Leak Detection Pump (LDP) - V144 - electrical connector terminal 1 to Motronic Engine Control Module (ECM)
J623 electrical connector T94 terminal 44 for an open circuit or high resistance.
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Using a multimeter, check the Leak Detection Pump (LDP) - V144 - electrical connector terminal 2 to Motronic Engine Control Module (ECM)
J623 electrical connector T94 terminal 49 for an open circuit or high resistance.
Specified value: 1.5 Ohms max.