Subaru LEGACY 2002 Quick Reference Index page 597

2. OPERATION
As the driven key rotates, the magnet turns causing the magnetic field of the Hall IC to change.
The Hall IC generates a signal that corresponds to a change in the magnetic field.
One turn of the driven key in the speed sensor sends 4 pulses to the combination meter, engine
control module and cruise control module.
(1)
(1) Revolution of transmission output gear
(2) Vehicle speed sensor
(3) Low speed
(4) High speed
(5) Signal (4 pulses per revolution)
G: TACHOMETER
The tachometer drive circuit is connected to the engine speed sensing circuit in the engine control
module.
When the engine speed increases or decreases, the voltage of the circuit also increases or de-
creases, changing the magnetic force of the tachometer drive coil.
The tachometer needle then moves in accordance with change in the engine speed.
COMBINATION METER
(5)
(3)
(4)
(2)
IDI-13
(6)
(7)
(8)
(9)
(10)
(6) Combination meter
(7) Speedometer drive circuit
(8) Odometer and tripmeter drive circuit
(9) Engine control module
(10) Cruise control module
Instrumentation/Driver Info
B6H0912E
H6H0419