Jetta L4-1.8L Turbo (AWD) (2000)
-
Connect test box VAG 1598/31 to control module wiring harness. The engine control module remains disconnected.
-
Connect multimeter to measure voltage between test box sockets 3 (terminal 15) + 54 (speed signal).
-
Switch on ignition.
-
Lift vehicle at front left.
-
Rotate front wheel and observe voltage display.
Specification: between 0 and at least 4 Volt fluctuating
If the display does not fluctuate:
-
Check wiring to speedometer/speedometer sender.