Date: Sun, 10 Apr 2011 12:19:45 -0700
Reply-To: mark drillock <mdrillock@COX.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: mark drillock <mdrillock@COX.NET>
Subject: Re: I guess if I'm putting on a tencentlife oil cooler . . .
In-Reply-To: <1302456797.5999.306.camel@TheJackUbuntuNetbook>
Content-Type: text/plain; charset=UTF-8; format=flowed
There is no "pressure too high" sensing on any Vanagon oil system.
On the single switch system the switch simply grounds the circuit for
the oil led and thus directly causes it to come on solid.
On the two switch system the switches feed only the logic board. The
logic board then directly flashes the oil led when it thinks it should.
It also has a connection to the tach signal and when the tach signal is
fast enough it uses the second switch as well as the first to determine
if the pressure alarm should be triggered. That engine speed is about
2000 rpm. When the alarm is triggered by the second switch the board
also sounds the alarm buzzer in addition to blinking the alarm led.
The second switch is located elsewhere on the engine from the first
switch. It also triggers backwards from how the first switch triggers in
that the second switch grounds when pressure is sufficient.
Mark
Rocket J Squirrel wrote:
> Hi Mark, I guess I'm still not getting this. Please remember that I'm
> dealing with a 1.9L version here.
>
> The sender has one wire connected to it, blu/blk, according to the
> wiring diagram on 97.56.
>
> What do that sender do? My first guess:
>
> Pressure too low = switch closes, connecting the blu/blk wire to
> ground,
> Pressure okay = switch open, blu/blk wire not connected to ground,
> Pressure high = switch closes again, blu/blk wire connecting to ground
> again?
>
> Thanks for your patience,
>
> --
> Rocky J Squirrel
>
>
>
> On Sun, 2011-04-10 at 08:56 -0700, mark drillock wrote:
>
>> The buzzer is only used for the high rpm pressure switch. The low
>> pressure switch just triggers a blinking led. The high switch triggers
>> both. I'm sure this is done so there is no alarm sounding when you have
>> the key on but engine not running. The alarm is loud enough to be heard
>> over all the other sounds while driving so it would be too loud with the
>> engine not running.
>>
>> Mark
>>
>>
>> Rocket J Squirrel wrote:
>>> Well, I wasn't trying to get all fancy like that. This being an 84
>>> model, and if the wiring diagram on 97.56 isn't lying, then just wiring
>>> a buzzer in parallel with the idiot lamp should give an audible alarm
>>> whenever the oil pressure lamp lights.
>>>
>>> There's only a single wire running from the op switch to the dash light,
>>> according to the diagram, so it can't be any fancier than that.
>>>
>>> Unless the wiring diagram is inaccurate, of course.
>>>
>
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