Speedometer Head: Description and Operation

1. DESCRIPTION
- The speedometer system is an electric type; it uses electrical wire and drives the speedometer according to electrical signals from speed sensor (MT model) or TCM (AT model).
- The speed sensor is installed on the manual transmission.
- For this reason, meter trouble (meter hand vibration, cable disconnection, etc.) is eliminated and transmission mechanical noise is decreased.
- The odometer and tripmeter are displayed by LCD (Liquid crystal display).

2. OPERATION
MT model: The speed sensor sends the vehicle speed signal (4 pulses per one turn of speed sensor driven shaft) to the speedometer drive circuit and odometer/tripmeter drive circuit in the speedometer.
AT model: The 1CM sends the vehicle speed signal (4 pulses) to the speedometer drive circuit and odometer/tripmeter drive circuit in the speedometer.

NOTE: The output signal from speed detection circuit is also used in engine control module, automatic transmission control module, etc.




3. SYSTEM DIAGRAM