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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old January 10th, 2002, 09:03   #1
peani
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Join Date: Jan 2002
Location: Richmond, VA
Default System reset after battery replacement

I need to replace the battery on my 99.5 Jetta, and was ready to do it myself until the dealer mentioned resetting a bunch of codes & stuff on the engine computer, such as the idle setting and whatnot. I thought you just had to worry about the radio and the automatic window feature, as stated in the manual. Any info on the subject? What should I watch out for? Is it really all that complicated or risky?
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Old January 10th, 2002, 09:12   #2
HowardZ
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Join Date: Oct 1999
Location: m
Default Re: System reset after battery replacement

From what I've read in the Bentley CD all you need is the radio code.

Once I purposely disconnected my battery for 24 hours, and I didn't even need to use the radio code.

[ January 10, 2002: Message edited by: HowardZ ]</p>
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Old January 10th, 2002, 10:29   #3
Turbo Steve
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Join Date: Jan 2000
Location: .
Default Re: System reset after battery replacement

I agree!

For a short-term battery replacement, no recoding should be necessary, but IF the ECU wants the Readiness Code reset for some reason, it's no big deal and all you need to do is drive your TDI.
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Old January 10th, 2002, 15:00   #4
3kidsnadezl
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Join Date: Nov 1999
Location: Roanoke, Virginia USA
Default Re: System reset after battery replacement

find you one of those memory maintainers that inserts in the cigarette lighter connected to a 9 volt battery. this will maintain the radio, air bag, and keyless entry. I had an experience last year when I went in for an alignment and left with a new battery and the car being taken to the dealer for resetting of the codes (fortunately the alignment shop paid the dealer). By getting one of these things you can change the battery yourself.
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Old January 10th, 2002, 17:45   #5
VW Vet
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Join Date: Sep 2000
Location: Maine
Default Re: System reset after battery replacement

I have had my battery (2001 Golf GL TDI 5 Speed) disconnected over night several times and nothing needed recoding.
It was disconnected for 3 weeks at the body shop and the EGR readiness codes needed resetting. This was done by performing a voodoo driving regimen as described in the Bentley manual. All was back to normal after that.

[ January 10, 2002: Message edited by: VW Vet ]</p>
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Old January 11th, 2002, 01:24   #6
nuke
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Join Date: Sep 2001
Location: Si-Valley, CA USA
Default Re: System reset after battery replacement

It's all in the bentley.

First thing you do after reconnecting the battery is make sure it starts and everything seems ok, shut the engine off and remove the key.

1. Get in car, close door, insert key and turn to the "run" position, but do not start engine. Hold accelerator to floor for at least 5 seconds, release pedal and turn off ignition switch.

2. From outside the car, close all doors, insert key in driver's door, turn to right to roll down all the windows. Remove key. Insert key into driver's door lock, Turn to the left to roll up all the windows, remove key.

3. Recode radio if necessary (it will often come on after a couple of starts by itself in the newer cars).

4. Drive the car on a hard run a few times with the pedal to the floor in 3rd for at least 5 seconds to set the readiness code. (there's an exact procedure in the manual, but just driving it will set the code eventually in a short time too).

That's about it.

There's some kind of adaptation setup for the auto-transmission, but I don't have one so I don't know for sure the process
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Old January 11th, 2002, 05:27   #7
jxpfeer
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Join Date: Aug 2001
Location: Boston MA
Default Re: System reset after battery replacement

this may be a dumb question, but what exactly does that readiness code mean / do ?
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Old January 11th, 2002, 16:56   #8
nuke
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Join Date: Sep 2001
Location: Si-Valley, CA USA
Default Re: System reset after battery replacement

Readiness code is how the engine tells a smog checker computer that everything in the engine is working correctly with regard to smog controls.

It's part of the OBD-II thing.
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Old April 30th, 2002, 00:10   #9
RevM
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Join Date: Dec 2001
Location: Saskatchewan
TDI(s): 2000 NB
Default Re: System reset after battery replacement

Just received my new Bentley CD for the NB. Not being very computer literate, can someone tell me where and/or how to find the system reset on the CD that Nuke outlines above? Thanks.

David

[ April 29, 2002, 12:12: Message edited by: RevM ]
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