information on air conditioner M48 street car

[remy78]

Hello, is-it possible to use one input for the information (12V) when the air conditioner clutch is on and with this information is-it possible to increase the RCO of the idle regulation ? Thanks . Rémy

[Martin]

Be very careful of connecting an inductive load like the AC clutch to an Dig or AT input on the ECU. The flyback voltage is very big and will damage the input in the ECU

[remy78]

OK, thanks for the information, but it's not really an answer for my question.

[SprinterTRD]

No, A digital input normally sits at 5V which is considered to be logic level high. Putting 12V on top of the 5V does not change anything. The digital input needs to be grounded to be active or logic low.

[yotamhks]

very simple but a messy and prehistoric.. solution :
Get a Relay, wire it as follows:

30
chassy ground/sensor ground

87
digital input 1/2

85
air condition +12V when on

86
chassy ground


you can use a transistor to do this but i don't know which transistor would fit there.