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Ethanol Sensor - Information

 
 

Here you get an overview of how an ethanol sensor / gauge works.

  1. Function
  2. Installation
  3. Electrical Wiring
  4. Ethanol Content
  5. Fuel Temperature
  6. Accessories
 
 

1 ▼

Function

An ethanol sensor is used to measure the ethanol content/quality of the fuel so that the ECU can adjust the fuel quantity accordingly. Fuel temperature is also measured as the OEM has designed the sensor this way.

2 ▼

 
 

Installation

The installation of the ethanol sensor is done on the return line. If it is installed on the pressure side, the flow can be restricted. Even though it is mounted on the return line, restrictions can still occur, and the sensor must then be installed in an adapter with a bypass function.
 
 


If the sensor is installed on the pressure line, the flow will most likely be restricted.

3 ▼

Electrical Wiring

The most commonly used ethanol sensors on the market measure both temperature and ethanol content, sending this information through 3 pins. The information is sent digitally with variable duty cycle and frequency.

  • Signal (digital output)
  • Sensor Ground
  • Power Supply (+12v)


Do not share any sensor between two gauges / ECUs as interference may occur.

 
 
 
 

If your software shows 0 degrees, the control unit/software cannot find your ethanol sensor, indicating that it is not connected correctly. In that case, check the wiring and connections.

If the temperature value shows 125 degrees (max), the sensor is polarity reversed. It may then be reversed in certain software; otherwise, just the connector needs to be re-pinned.

 
 
 

4 ▼

Ethanol Content

The ethanol sensor measures the ethanol content, which is displayed as a percentage in the control system's software. With this data, the tuner can optimally adjust the fuel injection according to the ethanol content.

 
 

5 ▼

Fuel Temperature

An ethanol sensor also measures temperature. In this way, you obtain a good measurement point for fuel temperature and can set up additional safety features.

 
 

6 ▼

Accessories

Since the OEM ethanol sensor is also used in the aftermarket for applications such as drifting and other racing, these are adapted to the application. You must use adapters to connect the sensor, as regular hoses and hose clamps do not work.

The sensor flows so poorly that sometimes a special adapter must be used to ensure sufficient flow.