just a quick question, when disconnecting battery to reset ecu is it black first then red and vise versa for connecting? should i leave it over night aswell??
black or red first?
- Thread starter Cr@zy
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black or red first?
thats what i've always done, need to leave it for half hour iirc to reset ecu, but yeah, if you can it will defo have done if you leave it over night
OP
OP
kl kl cheers m8.
that's exactly why you shouldnt take the live off first, any sparks during removal can earth through the circuit back to battery, possibly causing damage to microelectronic components.
if you disconnect the earth first, all electrics are isolated from battery and you can then take the live off with far less chance of sparking. all electrics are still earthed to chassis so dissipation still happens even with battery isolated.
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:yeahthat: almost exactly what my dad told me, he's an electrician
:yeahthat: almost exactly what my dad told me, he's an electrician
my dad was an electrician too
Well he's not now, and was technically a semi-conductor engineer but needs to have a very good knowledge of basic electricity in order to understand how microchips are made and tested
Reset ecu?, what does this do?, i just got the car back on the road and it had no battery for 3 weeks is this the reason why the fuel consumption has gone though the roof atm, well its started to head back to normal but not at the 42mpg as yet.
Am i correct in thinking this could effectively clear a fault on a rough running car?. sorry if these are dumb questions.
roy
Am i correct in thinking this could effectively clear a fault on a rough running car?. sorry if these are dumb questions.
roy
if you get sparks at the battery terminal as you remove it, that will send spikes down the live. if the chassis is still connected to the battery at that time, the spikes wil have a clear path back to battery through anything that is permaneltly live. if the battery was isolated from the chassis when the sparking happens the spikes do not have a clear path back to the battery which reduces the likelihood of damage.
roy lovelock said:
no it wont clear a fault. if the car runs rough you need to fix something. once a fault is repaired the ecu will eventually clear the fault code from memory itself (after a certain number of ignition switches without the fault reported to ecu)
