What if your VTEC got reset ????

[Kax2]

It is said that you must practise cation when changing battery of your Honda Vtec cars.

You have to hold the battery charge or memory of VTEC will be cleared and reset.

 

Anyone kana this before ?? I think only KM can help in Singapore, or maybe there're other workshops available ??

[Apollo]

regardless of what is said, VTEC is the enging/ physical part of the ECU and probably a software burnt into the EEPROM chipset. there r R0M where all ur data / error codes are logged, and reset of ECU will remove power and data as well.

[BoneStock]

Most of the w/s will connect a backup power to the cigarette lighter to preserve the voltage to your ECU when replacing the battery. This applies to all cars...not just VTEC.

[Redline]

No worries cos the Vtec setting is programmed in the ECU.

[Kax2]

My uncle's odesys just had his gear box changed, his clock got reset and apparently his idling became siao sometimes, going below 500rpm and then engine die.

Other times it's ok

 

Suspected to be case of vtec gotten reset.

I think that vtec has both hardware and software

Hardware in engine and software telling the hardware what to do

if software got resetted, then have to reinstall ?? Just hope that software is burn into the ecu ...

[Kax2]

Anywayz his car is from parallel importer so KM don't care or service it. SO how ? Anyone can help ? Thx

[Apollo]

mebbe his MAF/ O2 sensor or lamba sensor spoilt leh...

 

or mebbe his fuel pump gg up lorry liaoz. or the spark plug finally saw end of the light.

Edited June 10, 2005 by Apollo

[Schneider79]

You can start the car first... while the car is running, you can change the battery... after the new battery is connected, run for a while and everything will not be reset.

Clock stays, memory on HU stays, ECU will not reset.

 

Also, if your battery water leaks out of the battery and odize the battery holder, you pour some hot water on it and then it will not have this problem again.

[Yeobh]

Just plug this simple on-board memory back up powered by dry cell 9 volt battery to the cigarette ligher socket will save you all the headache.Get the agent to reset the "keep alive memory" to deafult will at least burnt a $50.00 hole in your pocket.

PM me if you need more details

Edited June 13, 2005 by Yeobh

[Yeobh]

Please do not teach this method of changing battery - it will work when you car is equipped ONLY with a DC GENERATOR. Running alternator should and never be diconnected from the battery, once you do that a heavy surge will take place and chance the on-board coumputer including your expensive ICE will go up in smoke or die a sudden death.By disconnecting the battery, the alternator will senses a no load situation and the unit will increase the amp output to the max - without anywhere to go, the generated amp will burnt the rectification unit ( all the diode will go.)

 

Please do check your fact before putting up for everyone to read !!

[Schneider79]

hey! this method is taught by the tyre workshop i went to ok. they did it on the cars which they changed the batteries...

[Yeobh]

Does not mean that this method is used by the tyre shop is the CORRECT method.You are not to be blame because you thought that was the right way.Some tyre shops even do not repair tyres correctly let alone do auto electrical work !!

God bless you if you wish to follow your tyre shop way of changing battery.

[Hmanxx]

from the way you describe, obviously you are not electrically trained..how much current being sucked out from power source is determined by the load the power source connnected to.

[Slowpoke156]

Running without the batt does screw up the electronics, you need the battery in place to buffer the alternator's output. I fried my ABS ECU because of this. A costly $3000 replacement.

[Yeobh]

You are right, I don't have a BSC in electrical eningeering either do I qualify for a BS degree.I only a saleman, to be precise a regional turn-key project saleman and now a specialty tool direct salesman and an armchair mechanic.

Do try on your car, run the engine to 2500rpm and totally disconnect your battery.Let us know the result.

[Jusnel]

i support Yeobh on his theory.

 

it's abit of a common sense not to change battery while yr car is running.

 

simple device like yr handphone, you should not take out battery while the handphone is still on, right???? you should off handphone, then take out battery.

 

Or while charging yr handphone, you decided to change battery..... you just take out the battery from the phone that is being charged and put in the next battery you wanted to charge, while the charger is still connected "live" to yr handphone???

 

for a complicated machine like a car, what more we must be more careful about this battery stuff.

 

one slight slip up or yr electronic stuff in car is not behaving well on that day, while you are trying to change battery while car is running, everything in car burn up!

 

i suspect yr tyre shop is bloody lazy to do it the short cut way.

 

 

alot of tyre shops cant even do a proper job on wheel alignment or balancing. some worse! cant even screw tight a nut on the wheel!!

Edited June 14, 2005 by Jusnel

[Kax2]

Great advice !! I'll take notice but this is like preventive measure, what about corrective measures ?? THx in advance

[Yeobh]

Once the default setting is erase due to no power supply , the only alternative is to get the car agent or workshop who has the scanner with the correct programme to the reset.

For those car owners who are more hands-on-type they can always use a simple fault code retriveing and restting device to do the work.

See attach - this device is programmed for reading and erasing fault codes only for cars assembled in Europe after yr 2000 and meet the the regulations pertaining to OEBD diagnostice socket configuration and programme.

Edited June 16, 2005 by Yeobh