You need to check the speed sensor signal which requires special scanners. Is your scanner capable of testing engine electronics etc?
SPEEDOMETER VEHICLE SPEED SENSOR (VSS) SIGNAL, CHECKING
Special tools, testers and auxiliary items
VAG 1551/1552 scan tool with VAG 1551/3 adapter cable
Multimeter (Fluke 83 or equivalent)
Connector test kit VW 1594
We shall check the voltage first if you don't have the necessary scanner.
Disconnect 3-pin connector from vehicle speed sensor -1-.
Turn on ignition.
Connect multimeter using test leads from VW 1594 to measure voltage at terminals 1 and 3 of connector.
Specification: 9-14.5 volts
Turn off ignition.
If no voltage was present:
Friday, February 13th, 2009 AT 2:04 PM