how to hard reset
#1
#2
taking off the battery doesn't immediately clear the memory all modules, there could be some stored power...that's why a touch to + saves the wondering, plus its much quicker.
#3
I'd wait a minute at least rather than cause such a spike!!
Also, it will only clear some module(s) - the ones with volatile memory (like the RAM in a PC). It won't clear all the modules with non-volatile memory (EEROM, flash, etc).
The PCM's KAM (keep alive memory) will be cleared (so the PCM will have to re-learn a lot of needed values such as how to idle smoothly and how to detect misfires and if it's already got misfires it will learn bad stuff as being normal!). The TCM (2003/3+ cars) isn't cleared and lots of other modules also aren't. You need a dealer-type OBD tool to clear those.
Also, it will only clear some module(s) - the ones with volatile memory (like the RAM in a PC). It won't clear all the modules with non-volatile memory (EEROM, flash, etc).
The PCM's KAM (keep alive memory) will be cleared (so the PCM will have to re-learn a lot of needed values such as how to idle smoothly and how to detect misfires and if it's already got misfires it will learn bad stuff as being normal!). The TCM (2003/3+ cars) isn't cleared and lots of other modules also aren't. You need a dealer-type OBD tool to clear those.
Last edited by JagV8; 07-15-2010 at 01:15 AM.
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Josef15111 (04-08-2022)
#5
#6
#7
Well..... just to clarify - if I actually wanted to clear KAM (e.g. after fixing an O2 sensor or the MAF), I would do so and the cheap and safe way is to disconnect the battery. But I'd do that and wait, i.e. leave the battery off for a few minutes.
But it would already be disconnected during the type of repair I've just mentioned. (If I were doing the repair.)
I'd reconnect swiftly so as to get a good solid connection and have it stay that way. Electrical spikes? No thanks. As few as possible.
But it would already be disconnected during the type of repair I've just mentioned. (If I were doing the repair.)
I'd reconnect swiftly so as to get a good solid connection and have it stay that way. Electrical spikes? No thanks. As few as possible.
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#8
Hi. I recently did a hard reset on my jaguar 2003 xtype and now it's not turning over when I turn the key. Thing is it was going before I did the hard reset. I've checked all the fuses. You can start the car from the starter motor. Now when I turn the key I have a lot of clicking noise on the dash. Please help.
#9
Hi. I recently did a hard reset on my jaguar 2003 xtype and now it's not turning over when I turn the key. Thing is it was going before I did the hard reset. I've checked all the fuses. You can start the car from the starter motor. Now when I turn the key I have a lot of clicking noise on the dash. Please help.
https://www.jaguarforums.com/forum/x-type-x400-14/
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S-Type Owner (03-06-2022)
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