AEM oil temp sensor not correlating with motec

Discussion and Support for MoTeC's M1 series ECUs

AEM oil temp sensor not correlating with motec

Postby Trigsby on Fri Jul 23, 2021 2:42 pm

Hello so I purchased a AEM 30-2012 temp sensor and set it up on motec with the data from aem. The voltage the ecu is getting is listing the temp to be about 20 colder than it is. When I check the sensor against resistance and the chart it’s spot on with the temp. Any ideas what would cause the voltage to be reading the temperature to be higher? Thanks.
Trigsby
 
Posts: 1
Joined: Sat Jul 03, 2021 1:26 am

Re: AEM oil temp sensor not correlating with motec

Postby SDean on Fri Jul 23, 2021 5:12 pm

Having a look at the supplied data on the AEM website, they have used a 2.2k ohm pullup for the voltage supply, where as the M1 uses a 1k ohm to 5V pullup. This will skew the voltage values produced by the sensor.

Try the numbers in the attached spreadsheet for this sensor.
Attachments
Fluid Temp SRS WTS-005-SRS-LC09.xlsx
(1.96 MiB) Downloaded 76 times
Stephen Dean
MoTeC Research Centre Melbourne, Australia
User avatar
SDean
Site Admin
 
Posts: 974
Joined: Tue Dec 02, 2014 9:29 am
Location: Melbourne

Re: AEM oil temp sensor not correlating with motec

Postby David Ferguson on Fri Jul 23, 2021 10:30 pm

I know it's probably a typo, but if not -- what MoTeC M1 inputs have a 5k ohm pullup?

The M1 Hardware Tech Note indicates the Temp inputs have a 1k ohm pullup to 5V.

The spreadsheet doesn't mention what the measured input conditions were (ie. pullup value and voltage).
David Ferguson
Veracity Racing Data
Check out Shift RPM - https://shiftrpm.veracitydata.com
David Ferguson
Pro User
 
Posts: 999
Joined: Fri Nov 07, 2008 1:45 am
Location: Paso Robles, California

Re: AEM oil temp sensor not correlating with motec

Postby SDean on Mon Jul 26, 2021 11:51 am

Hi Dave,

You are correct on that one, I fat fingered it heading out the door on Friday afternoon.

I've edited the post to show the correct information. It was supposed to be 1k ohm to 5v pullup.

The Temp sensors are tested in our climate test chamber using the AT inputs (so 1K to 5V) on a C185 Display.
Stephen Dean
MoTeC Research Centre Melbourne, Australia
User avatar
SDean
Site Admin
 
Posts: 974
Joined: Tue Dec 02, 2014 9:29 am
Location: Melbourne


Return to M1 ECUs

Who is online

Users browsing this forum: Google [Bot] and 12 guests