- Speedometer
- Tachometer
- Fuel gauge
- Coolant temperature gauge
Speedometer
The speedometer control is based on rectangular pulse signals generated depending on the signals from the wheel speed sensors and the ABS module. The speed of rotation of the wheels is measured by sensors that read the angular speed of rotation of the wheels on the gear electrodes on the hubs. The measured wheel speeds are transmitted to the ABS module in the form of pulse signals. The ABS module converts these signals into speed output signals and transmits them via the high speed CAN bus to the instrument cluster.
There are three models of speedometer display: 1) speed readings are presented in km/h; 2) speed readings are presented in miles per hour on the main display and in km/h on the secondary; 3) Canadian models show speed in km/h on the primary display and in miles per hour on the secondary display.
Tachometer
The tachometer control is based on engine speed signals from the ECM via the high speed CAN bus. These signals are generated based on the readings of the crankshaft position sensor (CKP). The signal is received by the instrument panel microprocessor, and the resulting microprocessor output signal controls the tachometer.
For models equipped with petrol and diesel engines, two different types of tachometers are installed. The tachometer for models with petrol engines is graduated up to 8000 rpm. The tachometer for models with diesel engines is graduated up to 6000 rpm.
Fuel gauge
The fuel gauge shows the amount of fuel in the tank. When the ignition is turned off, the pointer arrow returns to the empty tank position.
The instrument panel is connected to two fuel level sensors. One level sensor is located at the front of the fuel tank, the second at the rear. Both sensors are float type sensors with magnetic sensing element (MAPPS). For more information refer to Fuel Tanks and Lines (310-01A Fuel Tank and Lines - 4.0L). For more information refer to Fuel Tanks and Lines (310-01B Fuel Tank and Lines - 4.4L). For more information refer to Fuel Tanks and Lines (310-01C Fuel Tank and Lines - 2.7L Diesel)
The instrument panel supplies a reference voltage to each sensor. The instrument panel measures the residual voltage of each sensor, which is proportional to the amount of fuel in the tank and the position of the float lever. The amount of fuel in the tank is also calculated using vehicle tilt data received via the CAN bus from the electronically controlled parking brake module (EPB). The instrument panel uses the fuel level sensor signals and the EPB tilt signals to accurately calculate the amount of fuel in the tank and display the results on the fuel gauge. The instrument panel monitors these signals and updates the position of the fuel gauge needle approximately every 20 seconds. This prevents continuous arrows due to the position of the floats changing when braking or making a turn. When the ignition is turned off, the pointer arrow returns to the empty tank position.
A warning lamp is built into the fuel level indicator, which turns on if the amount of fuel in the tank is 10 liters or less for models with gasoline engines and 18 liters or less for models with diesel engines. Turning on the warning light is accompanied by an audible signal from the instrument panel buzzer to notify the driver that the fuel level is low. On upgraded instrument clusters, a low fuel message is shown in the message center display.
The instrument panel converts the fuel level value into a CAN signal and transmits it to the CAN communication system. On diesel models, this signal is used by the flame type heater to stop operation.
The following table shows the amount of fuel in the tank and the corresponding pointer positions.
| The amount of fuel in the tank (l) | Pointer arrow position |
| 4,82 | EMPTY |
| 12,5 | LOW FUEL (low fuel warning light on) Only for models with 4.0L V6 and 4.4L V8 engines |
| 14 | LOW FUEL (low fuel warning light on) Only for models with TdV6 engines |
| 25,5 | ONE QUARTER FULL |
| 45,4 | HALF FULL |
| 66,1 | THREE-QUARTERS FULL |
| 79,89 | FULL |
Coolant temperature gauge
The coolant temperature gauge is designed to inform the driver about the coolant temperature. When the ignition is turned off, the pointer returns to the low temperature position.
The coolant temperature sensor is connected to the ECM, which monitors the sensor signals and converts them into coolant temperature values. This data is transmitted over the high speed CAN bus for use by the instrument panel and other systems. For more information refer to Electronic Engine Controls (303-14A Electronic Engine Controls - 4.0L). For more information refer to Electronic Engine Controls (303-14B Electronic Engine Controls - 4.4L). For more information refer to Electronic Engine Controls (303-14C Electronic Engine Controls - 2.7L Diesel).
All models are equipped with the same type of coolant temperature gauges. The blue segment of the scale is intended to indicate a low temperature, and the red segment is an excessively high temperature of the coolant. At normal operating temperature, the pointer is located in the center of the scale. The various pointer positions are approximately equal to the following temperatures.
| Coolant temperature,°C (°F) | Pointer arrow position |
| Ignition off | Zero position |
| 40 (104) | Low (blue segment) |
| 75 - 115 (167 - 239) | Normal |
| 120 (248) | Start of overheating (red segment) |
| 125 (257) | Overheat |
Ambient light sensor
The ambient light sensor is located on the instrument panel next to the anti-theft warning light. The ambient light sensor is a phototransistor that measures ambient light.
The phototransistor measures the ambient light in lux and transmits a corresponding signal to the instrument panel microprocessor. The instrument cluster software adjusts the illumination brightness of the information LCD and the message center LCD accordingly to ensure optimal image visibility regardless of the time of day.
Vehicle configuration file
In the vehicle configuration file (CCF) contains all data relating to the technical characteristics and sales condition, immobilization codes and personal settings of the driver of this vehicle. This information is stored in the memory of the central distribution unit (CJB), engine control module (ECM) and instrument panel, allowing each system module to determine which systems and components are installed on the vehicle. Information is constantly transferred between these three modules, providing continuous duplication of data in the modules.
CAUTION: If a new instrument panel is to be installed, connect a Land Rover approved diagnostic system to the vehicle and follow the instrument panel replacement procedure. This will ensure that the coded information about the vehicle is correctly entered into the new instrument panel. The Land Rover approved diagnostic system will also record the current service interval and restore the settings in the new instrument cluster.
When a new instrument cluster is installed, a Land Rover approved diagnostic system is used to transfer the CCF data from the CBJ box to the new instrument cluster. Coded vehicle data, such as engine type, market, etc. become available and used to update the new instrument panel.
If the vehicle is service modified outside of the original factory specification, the CCF will also need to be updated with a Land Rover approved diagnostic system. Such a change may be considered the installation of non-standard wheels and/or tires, the installation by the dealer of auxiliary electrical equipment, such as a parking distance control system, etc.
Comments on this article