Passat L4-1.8L Turbo (AWM) (2004)
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Connect VAG 1598/31 adapter cable to control module wiring harness. Engine Control Module (ECM) is not connected.
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To measure voltage, connect multimeter between sockets 3 (terminal 15) + 54 (speed signal) of test box.
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Switch ignition on.
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Jack up front left wheel.
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Rotate front wheel, and observe voltage indicated while doing so. Specification: oscillating between 0 and at least 4 volts
If indicated voltage does not oscillate:
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Check wires going to speedometer and speed sensor.
