Sunpro Sport ST air/fuel ratio gauge - Toyota Yaris Forums

rkvin21 · 07-28-2009, 02:29 AM

Well i'm eventually going to get a turbo in my yaris but money is tight and i have to buy everything piece by piece so I decided to start with the gauges. I just bought a sunpro Sport ST air/fuel ratio gauge from autozone. I know I could have gotten it cheaper online somewhere but it was kind of a spur of the moment kind of thing for 39.99. I also got a 3 gauge mount to go on the A frame. Tomorrow I will try to do the install and take pics as well. The instructions kind of suck so it will be interesting. When looking under the hood I noticed that my ground wire for my negative terminal is attached to the chassis. Isn't it supposed do be attached to a ground on the engine block? anyways here are some pics:

here is a link to the manual:
http://www.sunpro.com/publish/2007/0...lish_16429.pdf

If and when I run into trouble i'll be here asking for help lol. I will take pics during the install of course

PatrickJohnson · 07-28-2009, 09:37 AM

grounding on chassis is no different than grounding on the block. You just need a heavily conductive point that is not positively charged.

rkvin21 · 07-28-2009, 04:45 PM

well turns out I'm at a stand still

. So far I have managed to figure out where/what wires to tap into( I hope!) but now I don't know where to drill a whole into the firewall I took off the dash to make things easier but on the opposite side in the engine bay there is plastic. Do I drill through the firewall and the plastic? Is there an easier way? well here are some more pics of my progress and where I believe I should tap into. Also I bought an add-a-circuit to use for one of my wires. If you do this make sure you buy the right amps and not the normal ones that are already in your car.

This is where I will put the ground:

These are the bolts on the airbag that keep the dash from coming off:

Somewhere here I will drill the hole in the firewall, but where???:

The arrow shows which wire I will tap into( is this correct/fine?):

The dash removed:

The arrow shows where I will tap into the o2 after the connector(This is the signal wire right?):

The cluster cover is removed to reach the 2 screws that help hold down the dash:

CTScott · 07-28-2009, 05:03 PM

On the Air Fuel Ratio Sensor connection, I would think that you'd want A1A+, which is the purple wire, rather than A1A-, which is the light green wire.

Also, instead of drilling the firewall, go through the giant grommet on the drivers side, which comes out right behind the battery.

rkvin21 · 07-28-2009, 05:25 PM

you mean this??

do I just try and feed the wires through it or is there more to it??

also thanks for the correction on the o2 sensor wire. I was hoping you would chime in

CTScott · 07-28-2009, 07:44 PM

That's the one. You can poke a small hole and feed the wires through.

rkvin21 · 07-30-2009, 12:13 AM

ok i need some major help. I finally got the afr gauge hooked up before dark. I was going to go for a test spin to see how it works. When I turned on my headlights the dash went dark. What is wrong??? I only tapped into the headlights, o2 sensor purple wire and plugged in the add-a-fuse in the fuse box. oh also the ground too. I plugged back in the 2 connections for the cluster. please help!!!! everything else seems to work just fine

rkvin21 · 07-30-2009, 12:23 AM

hahahahahahaha

false alarm I just realized that I had the dimmer switch all the way up which turned off the dash. *hits self in the head* well I will post pics of the install tomorrow

rkvin21 · 07-30-2009, 01:02 AM

Well I just went 25 miles with the gauge reading completely rich (1.0V). I'm going to take a guess that maybe I should have tapped into green wire instead. I am looking for the signal wire. I think i'm tapped into the heater power wire. Any ideas?

rkvin21 · 07-30-2009, 02:55 AM

Ok so I decided to switch to the green wire and travel home another 25 more miles with the same result. So now there are only 2 wires left. Weird thing is that I left the o2 wire untapped and when I turned it on it showed rich still. You would think that it would show lean(0.0V). So can anybody figure out what my problem is? The blue light is starting to get annoying. Probably intentional lol

CTScott · 07-30-2009, 06:57 AM

The dark green is the heater power, black is ground, purple is the + connection of the sensor and light green is the - connection to the sensor.

CTScott · 07-30-2009, 08:03 AM

Hang on, I don't think you can tap the AFR sensor with that Sunpro gauge, but instead need to tap the secondary O2 sensor. The Sunpro needs to see the raw 0 to 1V output and can't deal with the ECM's float voltage. According to the service manual, the ECM floats 3V on that sensor's output, so you will always see 3.0V on the light green and ~3.3V on the purple.

The secondary O2 Sensor is the one between the two cats. Its output is is a 0 to 1V waveform, without a float voltage. The output (OX1B) is the white wire on the sensor.

rkvin21 · 07-30-2009, 08:20 PM

Where is the connector?? I found the sensor and can't follow it cuz it goes into the chassis and disappears.

CTScott · 07-30-2009, 08:47 PM

It comes into the cabin floor below the AC controls.

rkvin21 · 07-30-2009, 08:52 PM

Is it just 2 wires, white and blue?

CTScott · 07-30-2009, 09:01 PM

4 wires - white (the one you need to tap), black, green, and gray

rkvin21 · 07-30-2009, 09:50 PM

Well I found it ( i think) it still reads rich (1.0V). What is going on??? this is where I found/taped it:

CTScott · 07-30-2009, 10:03 PM

If you have a meter, measure the voltage from the white wire to chassis ground and then from the white to the gray wire. According to the service manual, OX1B (white) to EX1B (gray) will output the 0 to 1 Volt waveform. The question is if EX1B is at ground, since the sunpro uses a single wire for its power ground and the sensor ground.

07-28-2009, 02:29 AM	#1
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	Sunpro Sport ST air/fuel ratio gauge Well i'm eventually going to get a turbo in my yaris but money is tight and i have to buy everything piece by piece so I decided to start with the gauges. I just bought a sunpro Sport ST air/fuel ratio gauge from autozone. I know I could have gotten it cheaper online somewhere but it was kind of a spur of the moment kind of thing for 39.99. I also got a 3 gauge mount to go on the A frame. Tomorrow I will try to do the install and take pics as well. The instructions kind of suck so it will be interesting. When looking under the hood I noticed that my ground wire for my negative terminal is attached to the chassis. Isn't it supposed do be attached to a ground on the engine block? anyways here are some pics: here is a link to the manual: http://www.sunpro.com/publish/2007/0...lish_16429.pdf If and when I run into trouble i'll be here asking for help lol. I will take pics during the install of course

07-30-2009, 12:13 AM	#7
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	HELP!!!! ok i need some major help. I finally got the afr gauge hooked up before dark. I was going to go for a test spin to see how it works. When I turned on my headlights the dash went dark. What is wrong??? I only tapped into the headlights, o2 sensor purple wire and plugged in the add-a-fuse in the fuse box. oh also the ground too. I plugged back in the 2 connections for the cluster. please help!!!! everything else seems to work just fine

07-30-2009, 12:23 AM	#8
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	False Alarm hahahahahahaha false alarm I just realized that I had the dimmer switch all the way up which turned off the dash. hits self in the head well I will post pics of the install tomorrow

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07-28-2009, 09:37 AM	#2
PatrickJohnson Drives: 2008 Yaris LB Join Date: Dec 2008 Location: Murfreesboro, TN Posts: 198	grounding on chassis is no different than grounding on the block. You just need a heavily conductive point that is not positively charged.

07-28-2009, 04:45 PM	#3
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	well turns out I'm at a stand still . So far I have managed to figure out where/what wires to tap into( I hope!) but now I don't know where to drill a whole into the firewall I took off the dash to make things easier but on the opposite side in the engine bay there is plastic. Do I drill through the firewall and the plastic? Is there an easier way? well here are some more pics of my progress and where I believe I should tap into. Also I bought an add-a-circuit to use for one of my wires. If you do this make sure you buy the right amps and not the normal ones that are already in your car. This is where I will put the ground: These are the bolts on the airbag that keep the dash from coming off: Somewhere here I will drill the hole in the firewall, but where???: The arrow shows which wire I will tap into( is this correct/fine?): The dash removed: The arrow shows where I will tap into the o2 after the connector(This is the signal wire right?): The cluster cover is removed to reach the 2 screws that help hold down the dash:

07-28-2009, 05:03 PM	#4
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	On the Air Fuel Ratio Sensor connection, I would think that you'd want A1A+, which is the purple wire, rather than A1A-, which is the light green wire. Also, instead of drilling the firewall, go through the giant grommet on the drivers side, which comes out right behind the battery.

07-28-2009, 05:25 PM	#5
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	you mean this?? do I just try and feed the wires through it or is there more to it?? also thanks for the correction on the o2 sensor wire. I was hoping you would chime in

07-28-2009, 07:44 PM	#6
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	That's the one. You can poke a small hole and feed the wires through.

07-30-2009, 01:02 AM	#9
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	Well I just went 25 miles with the gauge reading completely rich (1.0V). I'm going to take a guess that maybe I should have tapped into green wire instead. I am looking for the signal wire. I think i'm tapped into the heater power wire. Any ideas?

07-30-2009, 02:55 AM	#10
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	Ok so I decided to switch to the green wire and travel home another 25 more miles with the same result. So now there are only 2 wires left. Weird thing is that I left the o2 wire untapped and when I turned it on it showed rich still. You would think that it would show lean(0.0V). So can anybody figure out what my problem is? The blue light is starting to get annoying. Probably intentional lol

07-30-2009, 06:57 AM	#11
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	The dark green is the heater power, black is ground, purple is the + connection of the sensor and light green is the - connection to the sensor.

07-30-2009, 08:03 AM	#12
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	Hang on, I don't think you can tap the AFR sensor with that Sunpro gauge, but instead need to tap the secondary O2 sensor. The Sunpro needs to see the raw 0 to 1V output and can't deal with the ECM's float voltage. According to the service manual, the ECM floats 3V on that sensor's output, so you will always see 3.0V on the light green and ~3.3V on the purple. The secondary O2 Sensor is the one between the two cats. Its output is is a 0 to 1V waveform, without a float voltage. The output (OX1B) is the white wire on the sensor.

07-30-2009, 08:20 PM	#13
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	Where is the connector?? I found the sensor and can't follow it cuz it goes into the chassis and disappears.

07-30-2009, 08:47 PM	#14
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	It comes into the cabin floor below the AC controls.

07-30-2009, 08:52 PM	#15
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	Is it just 2 wires, white and blue?

07-30-2009, 09:01 PM	#16
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	4 wires - white (the one you need to tap), black, green, and gray

07-30-2009, 09:50 PM	#17
rkvin21 View User's Garage Drives: 2012 Toyota Yaris SE Join Date: Jan 2009 Location: Gilbert, AZ Posts: 52	Well I found it ( i think) it still reads rich (1.0V). What is going on??? this is where I found/taped it:

07-30-2009, 10:03 PM	#18
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	If you have a meter, measure the voltage from the white wire to chassis ground and then from the white to the gray wire. According to the service manual, OX1B (white) to EX1B (gray) will output the 0 to 1 Volt waveform. The question is if EX1B is at ground, since the sunpro uses a single wire for its power ground and the sensor ground.