Freelander System Description and Operation
INSTRUMENTS
DESCRIPTION AND OPERATION
88-11
Engine Coolant Temperature Gauge
The coolant temperature gauge indicates the temperature of the engine coolant. When the engine reaches normal
operating temperature, the gauge rests at the mid-point of the temperature scale.
If the engine coolant temperature becomes too high, the pointer will rise to the red segment of the scale to warn of an
engine cooling fault. At this position the engine coolant temperature is too high and continued operation could result
in engine damage; the vehicle should be stopped as soon as possible.
The engine coolant temperature gauge is driven by a CAN message from the ECM. The ECM derives the engine
coolant temperature from an engine coolant temperature (ECT) sensor. Refer to the applicable Engine Management
System section for ECT location and description.
ENGINE MANAGEMENT SYSTEM - SIEMENS, DESCRIPTION AND OPERATION, Description.
The temperature gauge is fitted with a return magnet causing the gauge to return to zero when the ignition is switched
off. The coolant temperature gauge is only operative when the ignition switch is in position II or when diagnostics are
selected.
When the engine is hot, the gauge will display normal temperature until the engine has been running for more than
15 seconds. This prevents the gauge moving to the red sector of the gauge if the ignition is turned off and then on
after a journey. If the engine is not started, the coolant pump will not circulate coolant and local hot spots occur in the
engine and give an incorrect temperature reading. The 15 second delay allows for the engine to be started and coolant
circulated, allowing the gauge to display the true average temperature.
Instrument Illumination
The instrument pack backlighting illumination is provided by three, T10 single filament 3.4W 14V bulbs. The bulbs are
rated at 14V to improve their resistance to failure and are fitted with a coloured shroud to give the required backlight
illumination colour.
The lamps illuminate when the side lamps or headlamps are switched on. In selected markets the instrument panel,
radio and switch illumination is also controlled by an instrument illumination dimmer control.
Warning Lamps
The following warning lamp descriptions cover all model and market variants. Therefore, some warning lamps may
not be present on specific models.
Left and Right Hand Indicators
The LH and RH indicator warning lamps flash in time with the exterior direction indicators when they are operated. If
either warning lamp flashes very rapidly, this indicates that one of the front or rear exterior indicator bulbs has failed.
When hazard warning lamps are operative, both direction indicator warning lamps flash simultaneously with the
exterior indicators.
Coolant Temperature Gauge Needle
Position
Engine Coolant Temperature
°
C (
°
F)
Cold
40 (104)
Normal
75 - 115(167 - 239)
Hot (Red zone)
120 (248)