Passat Sedan L4-1781cc 1.8L Turbo (AEB) (1999)
Engine Speed Sensor: Testing and Inspection
Engine Speed sensor (RPM), checking
NOTE:
Engine Speed sensor G28 is a speed and reference mark sensor. The engine will not start without a speed signal. If the speed signal fails while the engine
is running, the engine will stall immediately.
Special tools, testers, measuring instruments and auxiliary items required
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VAG 1551/1552 Scan Tool with VAG 1551/3B adaptor cable
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VAG 1598/22 Test Box
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Fluke 83 Multimeter
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VW 1594 Adaptor kit
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Wiring diagram
Test sequence
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Disconnect gray 3-pin Engine Speed sensor harness connector -arrow-.
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Measure resistance between terminals 1 + 2 of connector -1-
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Specification: 400 to 1000 Ohms
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Check sensor for shorting between terminals 1 + 3 and 2 + 3
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Specification: Infinity Ohms
If specifications not obtained:
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Replace Engine Speed sensor G28.
If Engine Speed sensor OK
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Connect VAG 1598/22 Test Box to Engine Control Module harness connector.