9000 CDE V6-2962cc 3.0L DOHC (B308) (1995)
as soon as the control module receives pulses from the crankshaft position sensor.
Engine Speed Signal
The control module sends an engine speed signal from pin 43.
This signal is a pulse train which varies between 0 and battery positive voltage with a frequency of about 37 Hz at idling speed and about 125 Hz
at 2500 rpm. This corresponds to three pulses per crankshaft revolution.
The engine speed signal is used by the main instrument display panel.