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Pull Up resistor

EFI Wiring Fundamentals

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Hello, I did not understand very well the operation of the Pull Up resistor and especially its concrete utility, can you define it for me in another way with a concrete example?

Does it serve to differentiate the different analog sensors?

Thank you in advance for your answer.

Best regards

It serves to create a value range. Let's say your sensor has a resistance of 500Ω. The ECU wants to read 1500Ω to get that value (Link ECU's use a 1K pullup. Other ECU's use different pullup values). This resistor also helps to protect components as it will limit the current that can go through the sensor.

okay thank you for this answer, if other user one of the different answers I would be taker to be sure to have understood?

Thank you

A pullup resistor is part of an electronic circuit known as a voltage divider. Here is some information on that topic:


thanks for this response

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