Combination Meter
WARNING AND INDICATOR LIGHTS
If everything is normal, the warning and indicator lights should be ON or OFF as shown above according to ignition switch positions.
Telltale (Graphic Monitor) Part 1:
Telltale (Graphic Monitor) Part 2:
TELLTALE (GRAPHIC MONITOR)
If everything is normal, the telltales should be ON, OFF or in other states as shown above according to ignition switch positions.
SPEEDOMETER
Description
- The speedometer system is an electrical type that uses electric signals from the speed sensor in the MT model or the transmission control module (TCM) in the AT model.
- The vehicle speed sensor is installed on the manual transmission.
- Since the system does not use mechanical components such as rotating cable, there are no opportunities of occurring such problems as meter needle vibration and cable disconnection. Also, it does not constitute any means of mechanical noise transmission.
Operation
MT model: The vehicle speed sensor sends vehicle speed signals (4 pulses per rotation of speed sensor's driven shaft) to the speedometer drive circuit in the speedometer.
AT model: The TCM sends vehicle speed signals to the speedometer drive circuit in the speedometer.
NOTE: Signals from the speed sensor or TCM are also used by the engine control module, automatic transmission control module, etc.
ODOMETER/TRIPMETER
Description
The odometer and trip meter readings appear on a liquid crystal display (LCD).
Operation
MT model: The vehicle speed sensor sends vehicle speed signals (4 pulses per rotation of speed sensors driven shaft) to the odometer/trip meter drive circuit in the speedometer.
AT model: The TCM sends vehicle speed signals to the odometer/trip meter drive circuit in the speedometer.
VEHICLE SPEED SENSOR
The vehicle speed sensor uses a Hall IC pick-up to generate speed signals. (MT model)
This sensor is installed on the transmission case and detects rotating speed of the transmission output gear.
The sensor generates 4 pulses per rotation of the speed sensor driven shaft and send them to the speedometer.
Construction
The speed sensor mainly consists of a Hall IC, magnet ring, driven shaft and spring.
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.
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 decreases, changing the magnetic force of the tachometer drive coil.
The tachometer needle then moves in accordance with change in the engine speed.
Water Temperature Gauge
- The water temperature gauge is a cross-coil type.
- The water temperature signal is sent from the thermo gauge located on the engine.
- The resistance of the thermo gauge changes according to the engine coolant temperature. Therefore, the current sent to the water temperature gauge also changes according to the engine coolant temperature. As the change in current causes the magnetic force of the coil to change, the gauge's needle moves according to the engine coolant temperature.
- When the coolant is at a normal operating temperature of approx. 70 to 100 °C (158 to 212 °F), the gauge's needle stays in the middle of the indication range as shown above.
FUEL GAUGE
General
- The fuel gauge unit consists of a float and a potentiometer whose resistance varies depending on movement of the float. It is located inside the fuel tank and forms an integral part of the fuel pump. The fuel gauge indicates the fuel level in the tank even when the ignition switch is in the LOCK position.
- All models are equipped with two fuel level sensors. These sensors are installed in the fuel tank, one on the right side and the other on the left side. Two sensors are necessary because the fuel tank is divided into main and sub tank compartments.
Operation
The low fuel warning light operates as follows:
The combination meter CPU continually monitors the resistance signal from the fuel level sensor. It turns on the low fuel warning light if a resistance value corresponding to the critical fuel level (approx. 76 Ohm) is detected successively for about 10 minutes or the period spent for driving a distance of 10 km.
This monitoring time has been decided to avoid false operation of the warning light which may happen when a large part of remaining fuel is collected temporarily in the sub tank compartment.