Temperature sensors

Attention

Do not connect the sensor ground to the engine ground. This leads to large errors in temperature measurement. The negative wire of the sensor must only be connected to the SGND.

Temperature sensors pullup

The temperature sensor requires a supply voltage through a resistor to operate. This is called a pull-up resistor. The pull-up resistor and the sensor resistance together form a voltage divider that produces a voltage proportional to temperature.

The ECU has analog inputs with built-in 2 kΩ pull-up resistors. They are suitable for sensors with a resistance of 1-5 kΩ at 20 degrees.

If you connect to the sensors in parallel with the stock ECU, use analog inputs without pull-up.

If you run out of pull-up inputs, or the built-in pull-up does not match the sensor resistance, use an external pull-up resistor. External pull-up resistor resistance = sensor resistance in the middle of the operating range (usually 20 degrees)

Engine coolant temperature (CLT)

Connects to CLT input

Intake air temperature (IAT)

Connects to IAT input

There are two options for installing the sensor.

1. In the intake pipe in front of the throttle valve
2. In the manifold behind the throttle valve

Attention! A manifold sensor installed away from air flow will not work. Therefore, you should use a standard sensor in the manifold, or carefully choose the installation location. VAG AAN, 1.8T engines can serve as a reference point.

Fuel / oil temperature

They are connected to a free analog input.