Author Topic: Capacitor Discharge  (Read 192 times)

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Offline TURBOHEAD

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Capacitor Discharge
« on: November 03, 2018, 14:52:54 PM »
Hi all :)

Found this out recently........Cap Discharge procedure (Electrical)

You know when you get weird things happen on your Phone....Computer...Tabl et etc, you just do a Hard Reset and all goes back to normal.

Because of ECU, electronic modules etc in your car you can sometimes get weird electrical gremlins pop up when you reconnect the battery.
This can be easily corrected by a sort of.......Hard Reset.

REASON:-.
...When you disconnect the battery....the ECU....modules etc will store power in the capacitors of these items...so when battery is re connected....you may have unexplained electrical faults. ....So to cure this you can do the following.

METHOD.:-

1) Disconnect the battery leads both Posative and Negative.

2)) If you don't wish to remove the battery....you need to place a clean dry cloth over the terminals....and lay the battery leads on top of the cloth          to avoid the lead from touching the battery terminals

3) Then using a short jumper lead with small crocodile clips.....join both leads together.  Leave the leads joined for as long as possible or
    overnight......this wil slowly drain all stored power in the Capacitors.

4) This will Hard Reset ECU and modules ......and thus prevent any possible electrical glitches from accuring when the battery is re connected.

5). Safety is paramount when doing this to avoid damage or injury.

This information was supplied on YouTube.....By a mechanic in the USA....called...."The Humble Mechanic"......Sorry I have forgotten how to post a link but you should find it yourself.

DISCLAIMERS:-

This is the first time I have come across this method and have not tried it myself.....but he said in his video that he has done this hundreds of times without problems. His videos are really informative and he is good at explaining all you need to know.

If you don't feel comfortable with this .....don't try it....He advises in the video that No damage to your car ...If you follow the method and safety precautions.

Let me know if you have heard of this....or if you have carried this out on your car.


Offline electric geen

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Re: Capacitor Discharge
« Reply #1 on: November 03, 2018, 19:52:20 PM »
No need for all this croc clip stuff, just short the positive connection to the battery to chassis (This means REMOVING the positive battery connection (Red) to the battery so that the battery is ONLY connected to the car via the negative (Black)). This will discharge any smoothing capacitors throughout the vehicle including the ECU.

The general consensus is that by leaving the positive battery cable off the battery for 20 minutes has the same effect i.e. no capacitor in any circuit will last longer than this supplying energy to any circuit in the vehicle.

Resetting this way will get rid of any temporary data in the ECU including averages for fuel injection timing etc. Useful if you change something after the engine has been running badly and is restored to normal, resetting the ECU then behaves as the engine was brand new with the default settings for fueling and timing, it will then gradually adjust (average out) to any part of the system that is not optimal over an hour or so (memory dependent).


Offline TURBOHEAD

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Re: Capacitor Discharge
« Reply #2 on: November 04, 2018, 01:03:08 AM »
That is great extra information  :)

So it is a recognised procedure......and has benefits to the well being of the brains side of the car.  Can I just add one more thing....there is a warning that when doing this Capacitor Reset......you don't use a memory saving device when doing the test......advised by the American mechanic.....Humble Mechanics on YouTube.

I will try this method in future......and is an extra to disconnecting your battery to re set codes.  It is always wise to be cautious about this type of procedure because as we all know it is easy to fry your expensive ECU and as sensors use very low voltages...damage is easy done.

Thank you for your input.  8)