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Need to "re-initiate" the ECM after removing the throttle body?

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Re: [gti-vr6] "Initiation" of the ECM after throttle body removal? Jim Bazzano <Jim_Bazzano@zd> Tue, 03 Mar 1998 21:02:17 -0500
[gti-vr6] Re: "Initiation" of the ECM after throttle body removal? AWE16VR6 <AWE16VR6@aol> Tue, 3 Mar 1998 22:24:58 EST



From gti-vr6-owner@dev.tivoli Tue Mar 3 20:14 CST 1998
From: Jim Bazzano <Jim_Bazzano@zd>
To: aqn@dev.tivoli
Subject: Re: [gti-vr6] "Initiation" of the ECM after throttle body removal?
Date: Tue, 03 Mar 1998 21:02:17 -0500
Cc: gti-vr6@dev.tivoli (mailing list - GTI VR6)
 
Todd, AWE16VR6 &lt;&#65;WE16VR6&#64;aol<img src=/i/dc.gif border=0 width=35 height=15>&gt; wrote:
> This only applies to OBD II t-bodies, and only if the flow rate has been
> changed, or the t-body is replaced.  [...]
> Once again, this only applies to 96 or later VR6, and only if the t-body has
> been replaced (since porting it is not an option until Garrett has a chip
> ready).

Jim Bazzano &lt;&#74;im_Bazzano&#64;zd<img src=/i/dc.gif border=0 width=35 height=15>&gt; wrote:
> Exactly -  in my case when I put on someone else's TB, my car would be like
> rev, rev, rev when the car was at idle - because the zero point or idle
> point was different on this new TB - solution is to teach the ECU this new
> TB's limits like Todd said with the initializing function of the OBD Tool
> or VAG tool, it only takes 30 seconds to do.

>  So what's the answer to this question:  on a ODB I car, does the ECM
>needs to be "re-inittiated" after the installation of a new TB?
>(Just for the record again, the car in question is a 95 GTI VR6, with
> ODB I.)
I believe this topic only applies to OBDII's.  Like Todd said OBDII
Throttle bodies have a stepper motor inside them to very accuratly
calculate their position.  I do not believe this design was used on OBD I
throttle bodies. I would bet that OBDI TB's are not as accurate, and nor
would they need to be because the OBDI ECU's aren't as strict.

my .02
jim




From gti-vr6-owner@dev.tivoli Tue Mar 3 21:43 CST 1998
From: AWE16VR6 <AWE16VR6@aol>
To: gti-vr6@dev.tivoli
Subject: [gti-vr6] Re: "Initiation" of the ECM after throttle body removal?
Date: Tue, 3 Mar 1998 22:24:58 EST
 
 << I am confused:  Todd et al. is saying that nyet, ODB I cars, no worries.
  Adam seems to be saying da, reprogram, comrade, even on ODB I cars.
  I'm not sure what the heck Jim Bazzano was referring to, ODB I or
  ODB II.  I assume ODB II, since that's what Todd was talking about?

  So what's the answer to this question:  on a ODB I car, does the ECM
  needs to be "re-inittiated" after the installation of a new TB?
  (Just for the record again, the car in question is a 95 GTI VR6, with
  ODB I.)

  If the answer is yes, hopefully my local VW contact has access to
  a VAG-like tool.

And then someone wrote, in private email:
> My car ran kinda weird, but I replaced the original TPS sensor off my
> stock TB, and it all returned to normal.

  There is that issue also:  the throttle position switch (TPS),
  which is on the ODB I throttle body and the Euro throttle body,
  and presumably also there on the ODB II throttle body.  In a ODB I
  car, does the ECM have to be "taught" (via the VAG tool) the new
  extremeties of the TPS?>>

The reinitialization procedure only applies to OBD II.  You can swap t-bodies
with no problems on your 95.  Sounds like the person in the private e-mail had
a defective TPS.

Todd
Air & Water
VW Tuning
Philadelphia
1-888-565-2257



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