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Hi. Im just joined MiNi2. Got an overheat on my 2012 Mini Countryman all4 S. Had to replace the engine with cost > $8,500. I now have a Check Engine Light with P2789 although the car runs great. Can anyone tell me what P2789 is and how to fix it? Thanks much.
 

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P2789 Clutch, adaptive learning - at limit

Is it a manual or auto?

Not sure how you would fix it though.
 

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Hi. Im just joined MiNi2. Got an overheat on my 2012 Mini Countryman all4 S. Had to replace the engine with cost > $8,500. I now have a Check Engine Light with P2789 although the car runs great. Can anyone tell me what P2789 is and how to fix it? Thanks much.
hopefully just a plug in and reset adaptions
below link is mini/bmw meaning of it that code etc,
 

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Discussion Starter #4
It is automatic with manual tiptronic. Car ran fine in either auto or manual tiptronic.


P2789 Clutch, adaptive learning - at limit

Is it a manual or auto?

Not sure how you would fix it though.
 

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Discussion Starter #5
hopefully just a plug in and reset adaptions
below link is mini/bmw meaning of it that code etc,
hopefully just a plug in and reset adaptions
below link is mini/bmw meaning of it that code etc,
 

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I read that on the Internet but was not sure because the MAS was replaced with a new genuine MINI MAS. I still have the Check Engine Light on. Just bought the Foxwell NT510 OBD2 Scanner. It detected and said hot film air mass low detection in short period. Any thought? Is there adaptive reset I need to do when changing the MAS?
 

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mass air flow sensor when cleaned or replaced should have adaptations reset, dont know if fox scanner will let you, if not insta d bmw software or autocom should
 

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mass air flow sensor when cleaned or replaced should have adaptations reset, dont know if fox scanner will let you, if not insta d bmw software or autocom should
Thanks mike1967. Will try MAS adaptation reset. Hope this is it. The Mini runs well with this Check Engine Light.
 

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Discussion Starter #10
its MAF mass air flow..
Hello mike 1967. I thought so, too. I replaced the MAF with genuine MINI MAF ($401 instead of $181 after market MAF). I did not know I have to do adaptation reset. Anyway, I tried to do the adaptation reset with Foxwell NT510 scanner. It has adaptation reset function but not specific to MAF. I remembered changing the MAF in the past without adaptation reset. Car ran fine without any CEL related to the new MAF.
Fault reading from Foxwell NT510 scanner shows "2789 present. Hot film air mass meter, correction signal, operating range: Period duration too short or electrical malfunction". I also noticed that after the CEL is erased, it came on immediately after I started the car (engine is running). I am going to check and record the MAF live data today. Thanks again.
 

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Discussion Starter #11
I took the MINI to the Dealer. They found the MAF sensor is reading correctly. They cleared the CEL and adaptation. CEL came on right after they started the MINI. They said the CEL on could be because different reading between the MAF sensor and engine valve solenoid. They suggest to pull the valve cover off and check the Valvetronic valve gear and complete air intake.
Does anyone know what they are talking about?
Is the engine valve solenoid the MAP sensor?
My MINI uses both MAP and MAF sensor. Could the problem be the difference reading between the MAP and MAF sensor?
 

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the map and mass air flow sensor are combined on the prince engine and is held in by a small torx screw under the vvt motor on side of inlet manifold,
the rocker cover has a pcv valve in it when fails the idle will go all screwy etc and engine will get 02 sensor codes for reading faults etc, if the vvt ie variable valve lift ie on inlet cam shaft it allows the valves to open further controlled by the ecu on the car clever stuff this allows more air in to the cylinder so the map maf would be expecting a certain amount of air flow, but if the valves dont open correctly the air flow is limited and ecu sees it and throws a code, could try a powerlatch as per below , this resets it all and if software glitch will clear it , at least it rules out a glitch
How to reset all ecu's

this procedure is called a power latch

firstly turn on the ignition not engine running,IE FOB IN DASH SLOT, TOUCH BUTTON UNTIL SEE DASH LIGHTS ON IE FUEL GAUGES ETC THIS IS IGNITION ON, THEN FOR IGNITION OFF TOUCH BUTTON ONCE THIS SWITCHES THE IGNITION OFF IE SAME PROCESS HAS TURNING A KEY ON AND OFF FOR IGNITION, ADDED THIS AS WAS POINTED OUT TO ME SOME MAY NOT KNOW HOW THE IGNITION ON AND OFF WORKS FOR THIS, THE BODY CONTROL MODULE STAYS ON FOR 3 MINUTES ANYWAY SO THIS WOULD KEEP IT ALL LIVE ANYWAY TO DO RESET ETC,
open bonnet remove battery positive lead and then turn off ignition.
then touch the positive lead to earth,this powers down all ecus and resets erasing intermittent faults in the process.then reconnect the battery lead.
if the vehicle doesnt start straight away leave the ignition on for 2-3 mins as it has gone into anti scanning mode.

IMPORTANT PLEASE READ CAREFULLY
upon starting the vehicle DO NOT TOUCH THE THROTTLE allow vehicle to idle until cooling fans cut in to allow the engine ecu to reset correctly and reprogramme the learning curve,then drive in all gears upto 4,000 rpm accellerating steadily.

as stated this resets all ecus so any electrical faults caused by conflict errors in programming will be erased and fixed.if the fault is still evident there is a problem that will need further diagnosis
 

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Discussion Starter #13
Found the problem!!!
The MAF sensor yellow wire was loose at the connector. Corrected the wiring problem. CEL w/ P2789 did not come ON. Will keep an eye of this for the next couple of days.
Thank you for those who provided valuable comments especially mike1967.
 

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result that it seems like the wiring looms start to break down with age and heat have seen many over the years and on the psa Peugeot Citroen stuff as they share the engines the one that happens most is thermostat housing leaks seeps over time and the coolant soaks up the wiring loom and in to the under body BSM and rusts the pins out and get total shut downs and cant even read the ecu for a code etc, makes me wonder of they are using a biodegradable wiring that break down and black with age and heat etc, as most of this starts around the 7 years old mark, also the wiring when gets wet all the time and road salts get to the copper the copper turns green this green corrosion causes high resistances and effect the system that run on them, see this more on the maf and map and 02 sensors and thermostat and temp sensor circuits, in the uk for a 2008 mini clubman cooper d bmw want £505 for new wiring engine harness,
 

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Discussion Starter #15
From my background experience in electrical/electronic design engineering, often times we disconnect an electrical connector by pulling the wire bundle instead of the connector itself. This ignorant action would cause loose wire at the connector pin overtime. The wire loose problem was found when "live data" the MAF sensor while wiggling the MAF wires.
 

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From my background experience in electrical/electronic design engineering, often times we disconnect an electrical connector by pulling the wire bundle instead of the connector itself. This ignorant action would cause loose wire at the connector pin overtime. The wire loose problem was found when "live data" the MAF sensor while wiggling the MAF wires.
at least found it and never cost to much money i've seen people do the throw a load of parts at it then get someone who knows what they are doing when checking wiring
 
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