Tachometer (rev counter) (MIU2)

/ 900 / 1994 / 3. Electrical system / Main instrument / Technical description / Tachometer (rev counter) (MIU2)

Tachometer (rev counter) (MIU 2)

Power for the main instrument display panel is supplied from fuse 17 to pin 55 of the main instrument display panel's control module. The control pulses needed by the control module in order to control the rev counter are obtained from the engine management system on pin 6.

The signal is a square wave which varies periodically between battery positive and 0 V, twice per revolution for 4-cylinder and three times per revolution for 6-cylinder engines.

Engine rpm	Frequency (approx.)
	4-cyl.	6-cyl.
Idling	45 Hz	30 Hz
2500 rpm	83 Hz	125 Hz

Tachometer (rev counter) (MIU2)

Our Friends