2.3 Coolant Temperature Sensor
The coolant temperature sensor is required to give the ECU information on the temperature of the
engine‘s coolant, allowing corrections for extreme cold and hot running.
This sensor is optional as this control is only required on engines that are particularly sensitive to coolant
temperature changes.
1 wire Sensor
These sensors are for dashboard coolant gauges and cannot be used with the ECU.
2 wire Sensor
These sensors are correct for use with the ECU. The two wires from the ECU can go either way round
on the terminals.
3 wire Sensor
These rare coolant temperature sensors are a 1 wire sensor and a 2 wire sensor in one package. The
1 wire part is for the vehicle’s dashboard coolant gauge and the 2 wire part is for the ECU. You can find
the correct terminals using a multimeter continuity test. The terminal for the dashboard coolant gauge
has connection to the metal body of the sensor. The two terminals for the ECU connection do not. The
two wires from the ECU can go either way round on the two applicable terminals.
Dashboard Coolant Gauge
A gauge cannot be connected onto the sensor being used for the ECU. The gauge must have its own
separate sensor supplied by the gauge manufacturer.
Retro-fitting
If fitting a sensor to an engine that does not have one as standard, the sensor must be fitted to the
engine side of the thermostat so that it sees the engine’s coolant temperature even when the thermostat
to closed. Omex can supply suitable sensors.
OMEM200 Installation Manual 2v10
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