Speedometer Head: Description and Operation
SPEEDOMETER AND ODOMETERDescription
The speedometer system is an electric type; it uses no speedometer cable and drives the speedometer according to electrical signals from magnetic pick-up sensor (speed sensor 2).
The speed sensor 2 is installed on the transmission.
For this reason, meter trouble (meter hand vibration, cable disconnection, etc.) is eliminated and transmission mechanical noise is decreased.
The odometer is driven by stepping motor.
Operation
The speed sensor 2 sends the vehicle speed signal (8 pulses per one turn of speed sensor driven shaft) to the speed detection circuit in the speedometer where this signal pulse wave is regulated.
The regulated pulse signal (4 pulses per one turn of speed sensor driven shaft) is sent to the speedometer drive circuit and odometer (trip meter) drive circuit.
NOTE: The output signal from speed detection circuit is also used in engine control module, automatic transmission control module, etc.