Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

BMW, Toyota, How to get temperature from external sensor, OBD

Status
Not open for further replies.

pwok

Newbie level 3
Joined
Nov 1, 2013
Messages
3
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
21
Hello,
I'm looking for informations about OBDII. I know how to read from ECU RPM's, Speed, trough the OBD port using ELM327, but I would like to get other information. Is it possible without professional diagnostic interface? I mean external temperature sensor which is under the front bumper. Climatronic uses this information, and I want too. :)

Thank you for great forum.
 

BradtheRad

Super Moderator
Staff member
Joined
Apr 1, 2011
Messages
13,814
Helped
2,738
Reputation
5,473
Reaction score
2,648
Trophy points
1,393
Location
Minneapolis, Minnesota, USA
Activity points
103,109
If you want to do it without the diagnostic interface...You will need to get at the wires coming from the sensor. You must either cut the sensor's wires, or attach a Y-connector.

If it is an ordinary analog sensor, then you can feed its signal to a circuit which responds in a linear manner, putting out a voltage which can be read on a meter.

As you know, there is a risk of ruining something in the vehicle's existing circuitry. You may not be able to put it back the way it was. Therefore it might be safer to install your own temperature sensor. You can calibrate it to the vehicle's temperature reading.
 

pwok

Newbie level 3
Joined
Nov 1, 2013
Messages
3
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
21
Thank you for reply.

I have to connect via OBD port, unfortunately. It means that ELM327 cannot read nothing except Engine Parameters.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top