References values MEMS3

BMW proprietary mode

Variable	mean	SD
Throttle angle (degrees)	4.00	0.00
Throttle potentiometer voltage (V)	0.60	0.00
Throttle valve status	Closed/ Open
Ignition switch	On
Aircon Fan Request	Requested
Aircon Clutch Request	Not requested
Drive/ Neutral status	Neutral
Security Input	High/ Low
Aircon switch	Off/ On
Alternate Aircon Fan Request	Requested
Intake manifold pressure (V)	32.54	0.50
Stepper position (steps)	18.94	0.12
Engine speed (RPM)	776.12	21.65
Idle error (RPM)	5.21	15.89
Vehicle speed (KPH)	0.00	0.00
Coolant temperature (Celcius)	82.00	0.00
Oil temperature (Celcius)	76.28	0.41
Intake air temperature (Celcius)	39.00	0.00
Ambient air temperature (Celcius)	-40.00	0.00
Fuel temperature (Celcius)	-40.00	0.00
Battery Voltage (V)	14.22	0.03
Crankshaft signal	okay
Cahaft signal	okay
High speed sync loss	sync loss
Cam input history	input was high
Cam position (degrees)	0.00	0.00
Crank position (degrees)	366.97	198.02
Coil 1 Charging Time (usec)	2827.00	0.00
Coil 2 Charging Time (usec)	3000.00	0.00
Injector Firing Interval (degrees)	720.00	0.00
Injector pulsewidth (msec)	2.72	0.06
Injector Deadtime (msec)	0.50	0.00
Fueling feedback correction bank 1 (%)	1.04	0.02
Oxygen sensor oltage bank 1 (V)	0.60	0.18
Fueling feedback correction bank 2 (%)	1.02	0.00
Oxygen sensor oltage bank 2 (V)	0.76	0.01
Oxygen sensor statuse bank 1	active
Oxygen sensor statuse bank 2	inactive
Requested cam period	?
Measured cam period	?
Inlet valve open angle	?
Inlet valve closed angle	?
Closed loop idle control status	active
Idle speed control test status	Not active
Throttle status	Closed
Engine cranking status	Not cranking
Engine started status	Started
Engine stopped status	Not stopped
Oerrun fuel cutoff status	Not active
High speed fuel cutoff status	Not active
Fuel pump	On
MIL Lamp	Off
Aircon Clutch	Off/ On
Radiator Fan	Off/ On
Auxiliary Fan	Off
o2 Sensor Heater	Off/ On
Engine Fan	Off/ on
Cruise Disable	Off
Purge valve duty cycle (%)	0.07	0.00

There are quite a few irrelevant data sets in the ISO mode for functions/ parameters that MG Rover did not implement on MEMS 3 - like ambient temperature, fuel temperature etc. Therefore, the numbers for these are largely spurious.

There is little spurious data in the BMW proprietary mode - although the inlet cam position data is irrelevant for non-VVC engines (hence the "?"). But not sure why there are still ambient temperature and fuel temperature outputs? Unless this is an error, or this is a hang-over from the ECU's original development??? Perhaps Philip can comment?

The data probably provides a starting point for knowing what normal values might be - although whether this car has a problem or not I don't know! LOL It runs very well, and there are no reported errors, so hopefully all is well.

I can get the same data from an MGZS 120, and in the future from a MGZR 105 (MEMS3).

I can also obtain MEMS1.9 data from my two MGFs The data you get from MEMS1.9 will be interesting to compare as it is quite an interesting ECU (as the fuel/ignition adaption post shows)

This is terrific stuff Rob.

If you can get the data from your two 1.9 MGFs, I'll build the spreadsheet to match the layout you provide and then add in my own values when I get a chance to do the same measurements. We could then do a mean of the means or range of the means depending what looks to be the most useful.

It looks as though there will be different sheets for different vehicles and MEMS versions as the output fields look to be different - not surprisingly.

I think we could end up with a pretty decent set of reference data using this approach.

Pity we can't upload Excel spreadsheets but they could be passed around via email if necessary. When I saw that .ods files can be uploaded I thought we could get around that but it seems as though you had a problem loading the file I uploaded into Excel. I'm using Office 365 and it seems to work fine with that. When we get a bit further on, perhaps we can investigate the file transfer a bit.

I've added xls and xlsx to the allowed file types, should be able to attach excel files now :broon:

Great

.

That’d be really helpful for me too - but at present I don’t have a running VVC.

See your message box johnny

would be great to see some examples from a MEMS 1.9 readouts, here’s my Excel off my MEMS 1.9

My post on the previous page (the one with the graph of O2 sensor voltages) is for MEMS1.9

On first glance, my values look fairly similar to yours. I haven't done much playing around with this recently. May get back to it one day!

Bump

Has there been any more progress with this topic?...just curious as it would seem to me to be quite a useful reference.