Date: Fri, 11 Mar 2011 11:19:58 -0800
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: ECU & Coolant Temp Sensor
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
hi,
re
Does the stock sensor give temperature readings to the ECU? I'm wondering if
this is one of the reasons why my fuel economy has dropped from 18-19 to
16-17, i.e. running rich. Furthermore, if the ECU does get data from the
stock system, how will the aftermarket system get tied into the ECU?
there are two separate temperature sensors..
one for the temp gauge ....and ones sends temp info the ECU.
neither temp sensor knows anything about what the other one is doing. They
are unrelated.
On a 1.9 wbxr you can see them right next to each other by the water pump.
on a 2WD 2.1 they are in the black plastic t-stat housing ..and harder to
see with a casual glance. .
You may have a more-than-usually difficult situation with your temp gauge
and flashing LED and pegging temp gauge.
it's fixable though.
Need to dig deeper.
I think the stock vanagon temp gauge is a really good temp gauge system ..
( even though that flashing LED can occasionally be a problem ) ...
are you sure you are putting in the same year , or same version, instrument
cluster when you swapped in another one ?
How vanagon-savvy is your tech ?
Circuits like this one can be challenging for people not very used to
vanagons' various indioscyncrocities.
----- Original Message -----
From: "Anthony Egeln" <regnsuzanne@YAHOO.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, March 10, 2011 8:20 PM
Subject: ECU & Coolant Temp Sensor
We've pretty much given up on attempts to repair the stock coolant temp
gauge & sensor system. Have swapped out the instrument cluster, replaced the
sensor and walked the wire. Still pegging max high with a steady flashing
light, but the thermal laser gun reveals a normal temp system.
There was a posting recently on "slime" affecting the level sensor in the
pressure tank, and I plan to share that with the tech. I suppose that would
only affect the blincking light anyway, not the temperature reading.
The tech working on it has found a completely independent (of the stock
system) aftermarket coolant temp gauge and sensor and he plans to install
that over the next two days.
One thing is unanswered in my mind. Does the stock sensor give temperature
readings to the ECU? I'm wondering if this is one of the reasons why my fuel
economy has dropped from 18-19 to 16-17, i.e. running rich. Furthermore, if
the ECU does get data from the stock system, how will the aftermarket system
get tied into the ECU?
I haven't talked to the tech about this yet and wanted to get the ideas of
the list.
Thanks, Anthony'89 Syncro GL 2.1 (Hidalgo)
