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
>>
>>
>>
>