ECU Master TUNER3 Manuel de service télécharger pdf (Page 9)

Sensors’ configuration

To make sure the device is working properly and it correctly calculates the fuel dose, you should connect and

calibrate the following sensors:

1) Coolant temperature sensor (CLT),

2) Intake air temperatur sensor (IAT),

3) Throttle position sensor (TPS),

4) Intake manifold absolute pressure sensor (MAP)

In most cases, you can use the engine factory sensors, which are currently present in the modified engine (co-

dividing the sensors by the DET3 device and the factory ECU).

Coolant temperature sensor

The coolant temperature temperature sensor is a temperature-sensitive thermistor (element, which resistance

depends on the temperature). The most often used temperature-sensitive resistors used in the combustion engines

are those of the NTC type (with the negative temperature coefficient, i.e. the temperature increase leads to the

decrease of the resistance). In the factory ECU, there is a resistor (Rx), which together with the temperature

sensor, makes the voltage divider. In order to configure the temperature sensor, you should provide the resistor’s

value Rx and the characteristics of the temperature sensor’s resistance.

On the picture below, there is a diagram of the co-division of the temperature’s sensor by the ECU and DET3.

In order to calculate the resistance of the resistor Rx in the ECU, you should:

1) Disconnect the connector from the temperature sensor.

2) Check the voltage while the ignition is on and save it as Uin,

3) Then, connect the resistor of the known resistance in the sensor’s plug (e.g., 10K ) Rk ( in Ohms),

4) Then, measure the voltage again and save it as Uout

Rx resistance can be obtained by the following equation:

Rx = Rk * (Uin – Uout) / Uout

ECU

DET 3

Analog In #3 (15)

+5V

CLT Sensor

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ECU Master TUNER3 Manuel de service Page 9