Vanden Plas L6-4.2L (1982)
Speedometer Head: Testing and Inspection
ELECTRONIC SPEEDOMETER
Description
The pulse signal required to operate both the speedometer and service interval counter is controlled by a speed transducer situated in the automatic
transmission unit in place of the angle drive.
The service interval counter. if fitted, is situated in the boot compartment and is located by removing the rear detachable boot trim panel.
It is important to note that should the harness controlling the pulse input to the speedometer become disconnected at the speedometer, the service
interval counter will also CEASE TO OPERATE. The control for resetting the speedometer is now situated in the speedometer fascia and is operated
by depressing the control button.
Fault Finding
The cause of faults which result in the incorrect operation of the speedometer are best diagnosed by substitution, having first checked all connections
and the fuse. Ensure the earth connections are clean and tight, and battery voltage is applied to the speedometer and the transducer.
