Date: Wed, 26 Jan 2005 12:28:17 -0500
Reply-To: Tim Demarest <tim.demarest@POBOX.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Tim Demarest <tim.demarest@POBOX.COM>
Subject: Re: Question about Mass Air Flow Sensor
In-Reply-To: <41F7A05B.6030405@comcast.net>
Content-type: text/plain; charset=us-ascii; format=flowed
Ken,
I don't know a thing about the technical details of the MAF, but I
do have a bone-stock 2.0L '97 Jetta in my garage, and a multi-meter. If you
can't get unstuck, I can probe some connectors to see what wires are hot when.
Tim
At 08:51 AM 1/26/2005 -0500, Ken Wilford wrote:
>Mark, do you know what this wire does? It is supplying power to the MAF
>but for what purpose?
>I guess I need a little MAF schoolin'.
>
>Ken Wilford
>John 3:16
>www.vanagain.com
>
>mark drillock wrote:
>
>>Ken, according to my Jetta Bentley for that year, the MAF sensor
>>red/blue wire you refer to should have power whenever the fuel pump is
>>running. It's power comes from current track 16, brought to there on
>>relay panel track "a" which comes from the fuel pump relay output leg,
>>4/87 on relay J17. The ECU controls whether the fuel pump runs, by
>>controlling the ground leg of the fuel pump relay coil 3/85 of relay
>>J17. Of course with a conversion the installer may mouse around with the
>>fuel pump control but it is best to do it like the factory did so the
>>pump shuts off unless the engine is running normally or trying to start.
>>There are a few other devices that also get power from the same source
>>so make sure that the other devices with a wire of the same color are
>>also connected to it.
>>
>>Mark
>>
>>
>>Kenneth Wilford wrote:
>>
>>>I think I have found a problem with the wiring harness on the conversion
>>>I am working on. The wiring harness is from a 97 Jetta with the 2.0l
>>>ABA engine. Anyway the wiring harness has a four wire plug on the mass
>>>air sensor. One of the wires is red with a blue stripe. If you have
>>>the Jetta Bentley Manual it is on page 97-297. This wire goes to a
>>>group of other wires that are the same color and they hook to what is
>>>called "Plus connection in Multiport Fuel Injection wiring harness". On
>>>the wiring diagram this is called E7 however the wiring diagram also
>>>calls it 87a. What I think is going on is that this wire is the power
>>>for the heated air mass sensor. But I don't want to hook up power to it
>>>if it isn't supposed to get power as I don't want to fry anything. Can
>>>anyone help me figure this out. Also is this wire supposed to be full
>>>time hot or just hot when the ignition on.
>>>
>>>This wire was cut and not hooked to anything when I got the conversion.
>>>The van runs but only when it is warm outside and also it doesn't seem
>>>to have a lot of power.
>>>
>>>Sorry but I am not super familiar with the whole mass air sensor thing.
>>>
>>>Any help you can give would be apreciated.
>>>
>>>Thanks,
>>>Ken Wilford
>>>John 3:16
>>>http://www.vanagain.com
>>>http://www.strictlyvwauctions.com
>>>http://www.eurovan.org
>>>http://www.vwcabrio.org
>>>Phone: (856)-327-4936
>>>Fax: (856)-327-2242
>>>
>>>
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