Jetta GLS L4-1.8L Turbo (AWD) (2001)
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Connect test box VAG 1598/31 to control module wiring harness. The engine control module remains disconnected.
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Connect multimeter to measure voltage between test box sockets 3 (terminal 15) + 54 (speed signal).
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Switch on ignition.
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Lift vehicle at front left.
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Rotate front wheel and observe voltage display.
Specification: between 0 and at least 4 Volt fluctuating
If the display does not fluctuate:
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Check wiring to speedometer/speedometer sender.
