Vehicle Speed Sensor (VSS) No. 1 Circuit (Speedometer Operates)

If odometer does not operate, repair as necessary. See INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. If odometer operates, remove instrument cluster, but leave electrical connectors attached.
Raise and support vehicle with rear wheels off of ground. Turn ignition on. Backprobing connector, connect voltmeter between ground and terminal No. 14 (Pink wire) at instrument cluster 23-pin connector. See Fig 1. Rotate drive shaft.
If voltage does not alternate between zero and 5 or more volts for each revolution of drive shaft, replace printed circuit and retest. If voltage alternates between zero and 5 or more volts, check for faulty wire (Pink wire) between instrument cluster and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. If wire is okay, replace ECM.

Fig 1: Identifying Instrument Cluster 23-Pin Connector Terminals