Engine Coolant Temperature Gauge (Instruments)

The fuel level sender signal is converted into a CAN message by the instrument pack as a direct interpretation of the fuel tank contents in litres. The ECM uses the CAN message to suspend OBD misfire detection when the fuel level is below 15% capacity.

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 - MEMS, DESCRIPTION AND OPERATION, Description. ENGINE MANAGEMENT SYSTEM - SIEMENS (ALL EXCEPT NAS), DESCRIPTION AND OPERATION, Description. ENGINE MANAGEMENT SYSTEM - EDC, DESCRIPTION AND OPERATION, Description. ENGINE MANAGEMENT SYSTEM – SIEMENS (NAS), 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.