Engine coolant temperature gauge (Instruments)

Each warning lamp incorporates a serviceable bulb. The colour of the warning lamp graphic denotes the category of the information the lamp is conveying:

• Red for warning.
• Amber for caution.
• Green and blue for information.

All of the warning lamps are concealed until illuminated.

Additional serviceable bulbs are installed to illuminate the odometer and provide background illumination. The alarm warning indicator consists of a serviceable, red LED and socket assembly.

The instruments receive electrical signals from sender units and transpose them into analogue gauge readouts. The fuel gauge pointer remains fixed at the latest fuel level reading when the ignition is switched off; the pointer’s of the other gauges return to the zero/rest position.

Engine coolant temperature gauge

The engine coolant temperature gauge is controlled by a voltage signal from the temperature gauge sensor. The electrical resistance across the temperature gauge sensor is proportional to temperature, so the voltage of the control signal and the resultant deflection of the gauge pointer are directly related to coolant temperature.

Speedometer

The speedometer and integrated odometer are controlled by a road speed signal that is input from either the gearbox mounted speed sensor (non ABS models) or the ABS ECU (ABS models). The signal consists of 4 pulses per revolution of the speed sensor, or equivalent on ABS models. The speedometer is calibrated to 5000 pulses/min at 60 mph (3107.6 pulses/min at 60 km/h). The odometer is a Liquid Crystal Display (LCD) that shows total and trip distances: Pushing the reset knob for less than 1 second switches between the six digit total distance display and the four digit trip distance display. When the trip distance display is showing, pressing and holding the reset knob for more than 1 second will zero the trip distance reading. The odometer is calibrated at 5160 pulses to 1 mile (3206.8 pulses to 1 kilometre).

Tachometer

The tachometer uses an engine speed signal from the ignition coil (petrol models) or engine control module (diesel models). The signal consists of 2 pulses per engine revolution.