Date: Wed, 4 Apr 2001 09:45:12 -0400
Reply-To: Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jay L Snyder <Jay.L.Snyder@USA.DUPONT.COM>
Subject: Re: Working ranges for Temp sensor and AFM
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Your numbers match what I measured last night on my old and new AFM. I
noticed the new AFM has what appears to be a capacitor fix built right into
the center pivot contact. It has a plastic (insulated) contact, with a
small black rectangular in-line gizmo. From it is a wire that then is
connected to the large metal arm that goes to the pin connectors. Anyone
else seen this? Across pins 2 + 3, I measured 700 ohms up to about 1200
at mid point, and then dropping to 550 ohms by the end of the vane travel.
Across 2 + 4, I measured ~28 ohms, rising to about 1000 ohms and then
stays there for the rest of the travel. Across 1 + 4 was 3000, which is
about right for the outside temp of 60F or so.
Jay
James Creech <jacreech@VISUALLINK.COM> on 04/03/2001 10:30:18 PM
Please respond to James Creech <jacreech@VISUALLINK.COM>
To: vanagon@GERRY.VANAGON.COM
cc: (bcc: Jay L Snyder/AE/DuPont)
Subject: Re: Working ranges for Temp sensor and AFM
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The Bentley graph shows, for both sensors (approx.):
0C / 32F 5-6k ohms
10 / 50 3.5-4k
20 / 68 2.5-3k
30 / 86 1.5-2k
40 / 104 1-1.5k
50 / 122 700-900
60 / 140 550-650
70 / 158 400-500
80 / 176 300-370
90 / 194 220-290
100 / 212 180-220
The AFM pin resistances are (4 on left to 1 on far right, looking into =
the
pin housing):
3 and 4 500-1000 ohms (total resistance of the pot)
2 and 3 ohms fluctuate as vane is opened (resistance thru wiper)
1 and 4 ohms according to table above (intake air temp sensor - temp=
1)
----- Original Message -----
From: David Beierl <dbeierl@ATTGLOBAL.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, April 03, 2001 7:13 PM
Subject: Re: Working ranges for Temp sensor and AFM
> Ah -- gotcha. I'll answer tomorrow unless someone else does, don't h=
ave
> Bentley with me right now. At equal temperatures, though, the Temp I=
> sensor in the AFM should measure about the same as the Temp II sensor=
in
> the motor, the specification is the same. Very roughly, from several=
> kilohms cold to a few hundred ohms or less hot.
>
> If you measure voltages, though, the AFM should run smoothly from zer=
o to
> about five volts (with ECU connected and ignition on) as you open the=
> flap. I don't have pinouts, but there is a ground lead, a +5 volts
lead,
> the wiper lead, and either one or two for the Temp I sensor. The tem=
p II
> sensor should be ?a volt or two? cold, and down around one or two ten=
ths
of
> a volt warm.
>
> david
>
>
>
> At 03:35 AM 4/3/2001, Javier wrote:
> >I am trying to help a friend with his van; we disconnected the
Temperature
> >sensor after feeling that idle was errant, and,.... it worked (altho=
ugh
with
> >slighty high rpm=B4s).
> >That is why I would like to know in which ranges (ohms) does this se=
nsor
> >work in order to find if this is malfunctioning and so, we will repl=
ace
it.
> >(Will use a multitester)
> >
> >Regarding the AFM (Air Flow Meter), it is my friend who thinks it is=
the
> >defective one.
>
> David Beierl - dbeierl@attglobal.net
=
