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4200 throttle reset

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28/7/2010 10:57:17  
 

Posts: 143
Since: 11/1/2010
Region: Birmingham
Status: offline
Hi
I am sure its been covered on here before but how do you reset the throttle on a 4200?
Thanks
28/7/2010 18:07:09  

Posts: 380
Since: 24/12/2007
Region: Greater Manchester
Status: online
Switch off at the battery isolator in the boot, wait for I think 30 minutes +, an hour should cover it definately, switch back on start car and allow it to run for 10 minutes without touching accelerator, job done, I think thats correct.

I'm sure someone else will either challenge or concur with the above, best of luck Miket.
29/7/2010 1:01:07  

Posts: 259
Since: 23/4/2010
Region: Witney, Oxfordshire
Status: offline
Not exactly correct miket. If the battery reset is for 30 mins+ it will remove any resident fault codes which could be useful at a later date on diagnostics. Also the ignition needs to be left on for at least 30 seconds before starting to allow various valves and solenoids to reset themselves. The correct procedure is as follows:
Open the boot, turn off the battery isolator switch for 30 seconds plus (30-40), turn back on, shut the boot, reset the alarm which will bleep, open the drivers door, get in shut the door and , making sure you do not touch any foot pedals, turn off the aircon and any thing else that might drain power, wait for the interior light to go off, turn on the ignition, and try to turn off the Sat Nav and radio as quickly as possible. Leave the ignition on for 30 seconds plus, during which time you will hear all sorts of wirring noises and then start the engine. Leave to run for about 10 mins without touching any pedals, until up to working temperature, and the fans have cut in (checks they are working), and job done. You can do this one time after another, which as Aussie will confirm had better results, depending on your initial problem.

< Message edited by trident -- 29/7/2010 1:17:11 >


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Stephen Bromley

05my 4200CC Grigio nuvolari/beige, Grigio mercuri wheels, Alluminio calipers and Nero Incrociata grille. Larini back boxes.
53 MG ZT 190+, 52 BMW 330ci Clubsport, 58 Smart 4-2 passion MHD

29/7/2010 9:24:53  
 

Posts: 143
Since: 11/1/2010
Region: Birmingham
Status: offline
Thanks Guys
26/8/2010 0:13:47  
 

Posts: 56
Since: 16/3/2009
Status: offline
Do you know if this is the same procedure for a 3200?  I have been  having throttle body issues - kindly being helped by  fellow forum member  (and all round good egg )Bill with a contacless unit which he's lent me whilst he converts mine to contactless spec.Seems to keep reverting into limp mode  and I have been taught a different reset proceedure by mechanics at my local Indy- switch ignition on  for 30 secs,  with car in neutral floor acceleratior for 30 secs , take foot off for 1min . Switch ignition off for a further 30 secs then restart- works for a while ,  then problems reoccur.Perhaps I should try your routine instead.Any thoughts would be gratefully received...Kim
26/8/2010 9:28:12  

Posts: 380
Since: 24/12/2007
Region: Greater Manchester
Status: online
3200 throttle reset is different here is a copy of the procedure:

With use and due to its design, the "fly-by-wire" throttle system gradually narrows its operating band between idle and full throttle. If left unchecked, this can result in an increasingly sensitive throttle pedal affecting drivability. As it's not exactly insensitive to start with, the result is a PITA with hill starts etc
Whilst you would normally use either an SD2 or SD3 to reset the engine ECU, the factory manuals (Engine volume: page 96 of the Fuel supply section) do contain another approach from the comfort of the drivers seat but do read very carefully.
If you are not sure of what you are doing, leave it to someone who does!

1) Reset the mechanical zero position
Put gear lever in neutral
Switch on ignition (to MAR position) but do NOT start the engine
Do not touch the throttle pedal for 2 minutes
Switch off ignition

2) Reset the mechanical Full Throttle position
Put gear lever in neutral
Switch on ignition (to MAR position) but do NOT start the engine
Fully depress throttle pedal and hold for 5 seconds
Release throttle pedal completely
Switch off ignition

The full text does not specify waiting until the various warning lights have extinguished themselves after switching on ignition, but I do not depress throttle (item 2) or start timing until they have.
By way of explanation, the no throttle setting (tickover or lower value) is 350/650mv whilst full throttle (upper value) is typically 3,100/3,300mv.
Apparently, the management system strategy gradually reduces the full throttle value by 5mv (for the next switch-on) every time the ignition is turned on (whether engine started or not) UNLESS full throttle is applied for 5 seconds at least once in that cycle (eg climbing a steep hill with full throttle etc). Therefore, under certain circumstances, the full throttle setting will gradually reduce, leading to over sensitivity at the pedal. The manual reset procedure restores the upper and lower values to their default design settings.
11/2/2011 17:56:48  
 

Posts: 8
Since: 26/1/2011
Region: London
Status: offline
Hi guys,  i hav just taken delivery of my GS.  is this throttle reset thing something i should do?  and if so is it the same as the reset procedure for the 4200?

thanks

Ben
12/2/2011 16:51:50  

Posts: 2477
Since: 27/1/2008
Region: Bristol
Status: offline
Yes and Yes

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Peter

4200 CC
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