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Coolant Temperature Sensor

Where is it?

Located on the water rail, which runs from the rear of the exhaust side of the cylinder head to the radiator top hose (brown connector).

What is it?

The CTS is a negative temperature coefficient thermistor (electrical resistance drops with temperature increase). The ECU measures the voltage drop across the CTS to establish the coolant temperature.

What's it for?

By measuring the coolant temperature returning to the radiator, the ECU can adjust the idle speed and the air fuel ratio to suite ie. at cold start. Should this sensor fail the ECU will assume a temperature of 60°.

Connector Details

ECU Engine Coolant Temperature Sensor (ECT)

PIN Colour Function Signal Destination
Sensor Ground Bus 0V ECU(Black) Pin 13
Coolant Temperature Output to ECU DC ECU(Black) Pin 15

Schema and Signals

coolant_temperature_sensor.txt · Last modified: 2011/12/07 12:40 by admin