Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
Leak Detection Pump: Testing and Inspection
With Manufacturer's Scan Tool
Leak Detection Pump (LDP), checking
Special tools and equipment
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Fluke 83 multimeter
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VAG 1527B voltage tester
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VW1 594 connector test kit
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Wiring diagram
Electrically checking leak detection pump
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Disconnect 3-pin harness connector of leak detection pump -V144-.
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Connect Fluke 838 multimeter to measure resistance between terminal -1- and -3- of -V144-.
Specification: 640 - 720 Ohms
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Connect Fluke 838 multimeter to measure resistance between terminals -2- and -3- of -V144-.
Specification: 17.5 - 27.5 Ohms
If the specifications are not attained:
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Replace leak detection pump -V144-.
Checking voltage supply
Test conditions
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Fuse 29 OK.
Test sequence
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Disconnect 3-pin harness connector of leak detection pump -V144-.
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Connect VAG 1527B voltage tester between connector contact 3 (positive) and engine Ground (GND).
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Start engine and run at idling speed: