Jeff? Anyone else? need some assistance with wiring chart...
08-06-2002, 05:50 AM
#1
AudiWorld Super User
Thread Starter
Join Date: Aug 2001
Posts: 5,291
Likes: 0
Received 0 Likes
on
0 Posts
Jeff? Anyone else? need some assistance with wiring chart...
Trying to figure out which is the signal wire for the second lamba sensor (i.e., O2 Sensor). It's in the upper right corner, G130. T4g are the 4 wire connectors. Z19 is the O2 heater.
I'm thinking T4g/4 is the signal wire, T4g/1 is the power wire to the heater, T4g/2 is the dedicated ground. Is Tg4/3 the ground for the O2 sensor?
BTW, G39 is the O2 at the turbo.
<img src="http://public.westcoastTT.com/gesttalt/tt_pics/wiring.jpg">
<img src="http://public.westcoastTT.com/gesttalt/tt_pics/wiring 2.jpg">
I'm thinking T4g/4 is the signal wire, T4g/1 is the power wire to the heater, T4g/2 is the dedicated ground. Is Tg4/3 the ground for the O2 sensor?
BTW, G39 is the O2 at the turbo.
<img src="http://public.westcoastTT.com/gesttalt/tt_pics/wiring.jpg">
<img src="http://public.westcoastTT.com/gesttalt/tt_pics/wiring 2.jpg">
08-06-2002, 06:12 AM
#4
Junior Member
Join Date: Sep 2001
Posts: 1,408
Likes: 0
Received 0 Likes
on
0 Posts
rail at the bottom looks like ground... T4g/4 looks like signal
(12) is listed as the ground rail, so that can be confirmed.
which means the big black arrows next to the big horizontal is probablt switched 12V power (as indicated by the transistor) meaning T4g/2, 3 are power, and Tg4/1 is ground, Tg4/4 is signal. Interesting that they have two separate power signals.
are you gonna try and use an O2 simulator?
which means the big black arrows next to the big horizontal is probablt switched 12V power (as indicated by the transistor) meaning T4g/2, 3 are power, and Tg4/1 is ground, Tg4/4 is signal. Interesting that they have two separate power signals.
are you gonna try and use an O2 simulator?
08-06-2002, 06:18 AM
#5
Junior Member
Join Date: Sep 2001
Posts: 1,408
Likes: 0
Received 0 Likes
on
0 Posts
if you are making an O2 simulator, Schwing's A/F meter can help
in fact, why pay $50? you could lead the way and give it a whirl yourself. steve, all you'd need to do for us is tell us on average what the A/F meter reads (in volts, of course) while you start up, and once you are running. also might help to know what the signal averages while driving around too.
the sensor probably has some sort of power isolator to avoid signal spikes, then damps the signal to 1V, which i believe is FSD (full-scale deflection) of the sensor (is that right steve?).
if we were to build an O2 simulator ourselves, we'd have to similarly smooth out the power signal (well, might not have to, but depends how noisy it is), then simply create a typical voltage using resistance. we could even be really clever and add a thermistor that will adjust the voltage based on how hot the sensor/catalytic converter is, thus allowing two signals for normal driving and idle =)
anyway, i keep saying "we" but gary, this one is all you =) i dont have the motivation to actually do it. but i can help you design the circuit and define the components if you want.
the sensor probably has some sort of power isolator to avoid signal spikes, then damps the signal to 1V, which i believe is FSD (full-scale deflection) of the sensor (is that right steve?).
if we were to build an O2 simulator ourselves, we'd have to similarly smooth out the power signal (well, might not have to, but depends how noisy it is), then simply create a typical voltage using resistance. we could even be really clever and add a thermistor that will adjust the voltage based on how hot the sensor/catalytic converter is, thus allowing two signals for normal driving and idle =)
anyway, i keep saying "we" but gary, this one is all you =) i dont have the motivation to actually do it. but i can help you design the circuit and define the components if you want.
08-06-2002, 06:26 AM
#7
Senior Member
Join Date: May 2000
Posts: 7,613
Likes: 0
Received 0 Likes
on
0 Posts
I agree, except I would say they have two power signals because one goes to the heating element,
and yes, the bottom rail is ground. In that case, I would say T4g/3 is the signal to the sensor itself.
Sound about right?
Sound about right?
