13 replies to this topic

[ashton0152]

Good evening,

                         Does any one have any technical information on what the resistance readings and voltages sound be on the oil temp sensor should be and the air temp sensor???

 

Have plugged in to my car I have 2 faults present oil temp and ambient air temp that wont clear want to do some further investigation but cant find anymore specs!!! 

 

Had a look through the post and cant see a topic that has any information??

 

Cheers Ben 

 

 

[tmsmini]

What reader are you using and what ECU are you reading?

 

Oil temp is not used by MEMS when used in a Mini.

Depending on the ECU, the ambient temperature is a calculated value.

Terry

[Bat]

Hi,

Both SPI and MPI have air temp sensors.

It's not a calculated value as that wouldn't allow the ECU to compensate for air density changes due to temperature.

As for sensor resistance have you looked in the MPI workshop manual?

Cheers 

[tmsmini]

The MEMS ECU has values for both ambient temperature and inlet air temperature. Only some fields are used in the Mini implementation of the MEMS.

The inlet air temp uses a sensor acquired value, the ambient temp has no sensor in a Mini.

 

This can be an issue with trying to read MEMS ECUs with equipment not specifically designed for a specific implementation.. Values are displayed that are not used or are not available in a Rover Mini.

 

I have a reference for this somewhere, it may have been in a generic article on the MEMS use in Minis.

 

That was the reason for me asking about which ECU and reader. The "ambient air temp" and "inlet air temp" are different values, but both are referred to in the original post.

Terry

Edited by tmsmini, 12 September 2018 - 02:06 PM.

[ashton0152]

It is a standard mpi ECU and I have scanned it with a snap on solus which is the only scanner that will communicate with the vehicle??? I work as a diesel fuel injection engineer at Bosch diesel agent so have access to a few bits of diagnostics equipment.

I was only doing it to make sure there are no codes to clear as i have just finished a full restortion the car seems to run fine I think the faults are ghost codes that wont clear!!!

I checked the air temp sensor in the throttle body and water temp sensor in the thermostat housing resistance seems ok started up at about 3.2kohms when hot went down to about 0.9kohms on both havnt checked oil temp sensor yet and am going to check continuity on wiring and voltage!!

Thanks for the help hope have explained myself

[tmsmini]

Does the Solus have a selection for the Mini year you are scanning?

 

This thread has some good documentation in it:

http://www.theminifo...-perhaps/page-5

 

The RCL0193 manual supplement has information about the MPi and the AKM7169 has info on the SPi.

 

You may have to dig through it to find valid links though.

There is also an article on working with the MPi from one of the magazines.

Is there a particular issue you are trying to resolve?

Terry

EDIT:

Depending on the coolant temp sensor in use, a similar type was used on some of the MGF and a I believe a Caterham/Seven also used this sensor.

This site has some information:

http://www.tom-seven...perature_sensor

 

Somewhere in the site there are voltage values but not resistance values. I don't see them right off.

The values in the table never matched the values I got in my voltage testing.

 

Another edit:

This is the page from the German MGF site that has resistance values for the sensors. MGF actually uses two sensors for coolant, one for gauge and one for the ECU

 

https://www.mgfcar.de/sensor/

Edited by tmsmini, 17 September 2018 - 12:30 AM.

[brivinci]

There are apps that you can get and run on Android/Windows based phones/tablets/computers, in conjunction with a correctly built cable of course, that are purpose built for MEMS and these cars. I would go with that rather then the one you are currently using as it is clearly not giving you the correct info.

 

Read this thread posted a few days ago. There are links to YouTube vids showing someone building the cable and running the software.

 

http://www.theminifo...pp-code-reader/

Edited by brivinci, 12 September 2018 - 03:46 PM.

[tmsmini]

I don't believe any of these currently work for the MPi/MEMS 2J systems.

[ashton0152]

Thanks for the information tmsmini all information is useful i have a folder i keep it all in to reference when i need it!!!

The solus can select make model and year of the car if you just try obd and scan doesnt communicate with any machine!!

There is no issue in particular i am tryin to sort i think everything is running sweet at the moment touch wood! Just got the car back on the road after a long and expensive rebuild and brought it to work to plug in and clear any codes and i got one about oil temp and ambient air temp so just doin some extra work to make sure all is ok?? I have the print out on a memeory stick will up load it later so you can see!!

Thanks for all the information will have a dig through and see what i can find

Cheers Ben

[ashton0152]

This is the fault memeory

Attached Files

•  20180913_174753.jpg   40.16K   4 downloads

[Bat]

Hi,

Neither of those are fitted to a mini.

The oil temp sensor if you have one is only for the gauge.

Cheers 

[ashton0152]

Been looking on autodata today at work at the pun configuration for ecu and yeah you are correct these are not monitored by the ecu!!!

Which is good news that i have managed to build the car and introduce no faults ???

Just need to put some miles on the clock now hopefully get to stanford hall end of the month!!!???

[brivinci]

Well, that certainly is saying something. Congrats! How about a picture of said Mini?

[ashton0152]

Yeah goin to get some good shots and sort it out!!!