Passat L4-1984cc 2.0L DOHC (1991)
Hall Effect Sensor: Testing and Inspection
Hall Sender, Checking
HALL SENDER, CHECKING
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remove fuse 18
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fuel pumps must not run during starting or catalytic converter could be damaged
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disconnect power output stage (N 70) harness connector from ignition coil
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connect US 1115 LED tester to terminals 2 and 3 of harness connector using jumper leads from VW 1594 adaptor kit
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operate starter and check for signal from Hall sender (G 40)
If LED flickers
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Hall sender is OK and checking is complete
If LED does NOT flicker
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switch OFF ignition
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disconnect Hall sender harness connector at ignition distributor
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switch Fluke 83 multimeter to 20 Volt range
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connect multimeter to outer terminals of harness connector using jumper leads from VW 1594 acceptor kit
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switch ON ignition
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observe voltage supply to Hall sender from CIS-E Motronic control unit (J 204)
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must be 9 volts minimum
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slide rubber boot (covering Hall sender harness connector) up the wires but leave the connector connected