Pscan to adjust idle speed and reset learnt values
Replied by Jon-Mini on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193311well mine does , as seen in the log files , its a 1999 MPI mini so I'd guess they all do.
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Replied by pscan.uk on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193312With some of these conditions it is clear what it is looking for but with others not so much.
For example it is clear that the coolant temperature must be at least 85 degrees C and then it forces the technician to wait for five minutes before checking the oil temperature.
However it isn't that clear what temperature it's looking for, so I am going to say 85 degrees C as well. Moreover I see no need to wait for five minutes if it's already there.
It also monitors engine revs and I think the throttle closed switch.
The first cut of this might be a little bit experimental but it should be out this week.
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Replied by pscan.uk on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193317Please Log in or Create an account to join the conversation.
Replied by Roverlike on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193318pscan.uk wrote: Can anyone tell me if there is an idle screw adjustment on other Rovers fitted with the MEMS2J, or is this unique to the MPI Mini?
As far as I know all throttle bodies for Rover 200/25/ZR have idle screw adjustment, either plastic or metal throttle bodies. Mems 2J is used in case of Vi and BRM so yes, they do have idle screw adjustment.
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Replied by pscan.uk on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193322I would appreciate some people to test it.
I have only tested it on an emulator at this time but it isn't the same as a real car.
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Replied by pscan.uk on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193323If the only people who test it have warped throttle bodies or air leaks then we won't get very far.
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Replied by pscan.uk on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193328Stage1. Waiting for the engine coolant to get to 85 deg C.
Stage2. The engine coolant now exceeds 85 deg C but the engine oil doesn't.
Stage3. After either 5 minutes, or the oil exceeds 85 deg C, pscan goes into calibration mode.
You would need to turn the idle stepper adjustment screw until a stepper reading of 26 is achieved. When you press "back" it should be saved.
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Replied by sworkscooper on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193329Hi Jon . Yes they all have an oil temperature sensor . Our Mini still has it but I replaced the dial for a pressure gauge some years ago now as I prefer to see pressure rather than temperature. The car now gives a fault code for open circuit for this but I just ignore it.Jon-Mini wrote: " Do all MPI Minis have an oil temperature sensor? "
well mine does , as seen in the log files , its a 1999 MPI mini so I'd guess they all do.
John
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Replied by Nickjowen on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193332I really appreciate you adding this function to the already brilliant diagnostic tool.
It has just fixed a “hanging idle issue” that I have had for the last 5 months. I had tried various new parts but to no avail.
I have just plugged in Pscan and it stated that my stepper position was at circa 26 steps when fully up to temperature. This made me think that the stepper motor was not the issue but I thought I would have a play with it as I could always set it back to where it was.
It is now set at 46 steps and idles at 920 ish and the revs no longer hang. It seems to be perfect with this set up.
Thanks very much.
Nick
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Replied by pscan.uk on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193333or is it that the "calibration" does some magic as well?
When I started with this I was wondering if folks could achieve the same thing by putting stepper position on the screen in live data view and adjusting the screw to get 26, but as I got into it I realised that the T4 is doing more than that. It is interrogating the ECU for stepper value but there is also some "secret sauce" in there as well that I hadn't seen before.
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Replied by Nickjowen on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193336Please Log in or Create an account to join the conversation.
Replied by pscan.uk on topic Pscan to adjust idle speed and reset learnt values
Posted 4 years 5 months ago #193337If you have a bigger throttle then I guess it might need more than 26 to close it enough.
Go too far the other way and it would run out of steps to open the throttle if you load the engine (so all accessories switched on).
So I suppose on a hot idle with everything off you want a number towards the smallest end that you can get away with.
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