Air Flow Signal/Sensor
Thread Starter
Lexus Fanatic
iTrader: (13)
Joined: Jul 2003
Posts: 10,681
Likes: 9
From: Tulsa, Oklahoma
Confused by S-AFC installation - ATTN VSC
Guys/Dennis,
OK, I am going through the installation for the S-AFC and I am pretty confused by what I have read so far. I would like to thank Dennis for his write-up, which although confusing me, is helping a great deal.
In Dennis' write up - he says that you use brown, black, pink, orange, grey, green and red. This would leave the blue, white and yellow open.
But, when it comes to the ECU diagram it says that the yellow is the airFlow/Pressure Signal OUTPUT, and the white is Air Flow/Pressure Signal Input.
From the T7-a diagram you need the following wires
Ground - Black and Brown
IG Power - Red
Throttle Signal - ?
Air Flow Signal - ? ( Input or Output?)
RPM SIgnal 1 - ?
RPM Signal 2 - ?
Then later on (post 19) it says use RPM2 not RPM 1 - now this confuses me even more as this means I have a spare wire.
Basically, and it may be on the website but I haven't found it, I need to know which color wires go to which of the above wires.
Any help would be greatly appreciated.
Jonny
OK, I am going through the installation for the S-AFC and I am pretty confused by what I have read so far. I would like to thank Dennis for his write-up, which although confusing me, is helping a great deal.
In Dennis' write up - he says that you use brown, black, pink, orange, grey, green and red. This would leave the blue, white and yellow open.
But, when it comes to the ECU diagram it says that the yellow is the airFlow/Pressure Signal OUTPUT, and the white is Air Flow/Pressure Signal Input.
From the T7-a diagram you need the following wires
Ground - Black and Brown
IG Power - Red
Throttle Signal - ?
Air Flow Signal - ? ( Input or Output?)
RPM SIgnal 1 - ?
RPM Signal 2 - ?
Then later on (post 19) it says use RPM2 not RPM 1 - now this confuses me even more as this means I have a spare wire.
Basically, and it may be on the website but I haven't found it, I need to know which color wires go to which of the above wires.
Any help would be greatly appreciated.
Jonny
Power = Red
TPS = Gray
Ground = Brown
Ground = Black
A/F signal out = pink
A/F signal in = orange
Tach/RPM = Green
you would not use white or yellow because that's used for MAP (Mass Air Pressure) which we do not have. Instead you would use pink and orange wires. You would simply tape these up so they don't touch something and get shorted out.
this leaves the blue wire. This is used to gauge O2 sensor readout. This drains a lot of voltage out of the S-AFC. Trust me and leave this one aside taped up and don't use it. it's not too accurate anyways because of the voltage drop and delay that's caused by it.
so like I said in the original thread, use brown, black, pink, orange, grey, green and red
tape up white, yellow and blue and don't use them.
TPS = Gray
Ground = Brown
Ground = Black
A/F signal out = pink
A/F signal in = orange
Tach/RPM = Green
you would not use white or yellow because that's used for MAP (Mass Air Pressure) which we do not have. Instead you would use pink and orange wires. You would simply tape these up so they don't touch something and get shorted out.
this leaves the blue wire. This is used to gauge O2 sensor readout. This drains a lot of voltage out of the S-AFC. Trust me and leave this one aside taped up and don't use it. it's not too accurate anyways because of the voltage drop and delay that's caused by it.
so like I said in the original thread, use brown, black, pink, orange, grey, green and red
tape up white, yellow and blue and don't use them.
Last edited by VSsc400; May 16, 2005 at 07:07 PM.
also i don't know which diagram you are looking at but this is the diagram you should be looking at. From the wire schematic you are reading back to me you are looking at the wrong diagram.
looking at the diagram below you should be able to wire the whole thing up.
looking at the diagram below you should be able to wire the whole thing up.
Originally Posted by Dx3
Guys/Dennis,
Then later on (post 19) it says use RPM2 not RPM 1 - now this confuses me even more as this means I have a spare wire.
Then later on (post 19) it says use RPM2 not RPM 1 - now this confuses me even more as this means I have a spare wire.
your ECU has RPM1 and RPM2 but S-AFC only has 1 RPM signal wire. You connect the S-AFC RPM signal wire to the RPM1 on the ECU.... no spare wires....
basically you are hooking up the green wire on the S-AFC to the RPM1 on the ECU... leave RPM2 on the ECU alone
Thread Starter
Lexus Fanatic
iTrader: (13)
Joined: Jul 2003
Posts: 10,681
Likes: 9
From: Tulsa, Oklahoma
Dennis,
One more question. You said here to use RPM 1 and leave 2 alone,
but on post 19 of the other thread you say to use RPM2 not RPM1.
So which one is it
Peace,
Jonny
One more question. You said here to use RPM 1 and leave 2 alone,
but on post 19 of the other thread you say to use RPM2 not RPM1.
So which one is it
Peace,
Jonny
Trending Topics
Originally Posted by Dx3
Dennis,
One more question. You said here to use RPM 1 and leave 2 alone,
but on post 19 of the other thread you say to use RPM2 not RPM1.
So which one is it
Peace,
Jonny
One more question. You said here to use RPM 1 and leave 2 alone,
but on post 19 of the other thread you say to use RPM2 not RPM1.
So which one is it
Peace,
Jonny
makes no difference =)
but be like me and use RPM2.
if I remember correctly I think I used RPM 2 because the wire was on top and RPM1 was on the bottom.....
ClubLexus Stories
Celebrating Lexus & Toyota from Around the Globe
Top 10 Lexus & Toyotas to Drive Before You Die!
Joe Kucinski
Top 10 Lexus/Toyotas With The LEAST 5-Year Depreciation
Joe Kucinski
Lexus LC500 Convertible Auction: A Preview of Rising Values?
Brett Foote
GX 550 vs TX 550: Best 3-Row Luxury Lexus Family Hauler
Michael S. Palmer
9 Best Lexus Models You Can Buy for Half Price (And 1 You Shouldn't!)
Joe Kucinski
2026 Lexus NX Buyer's Guide: Models, Features, Prices & More!
Brett Foote
Top 10 Reasons to Buy a Lexus TX 550h+ (& 3 Reasons to AVOID!)
Michael S. Palmer
Top 10 Lexus & Toyota Models of the 1990s RANKED!
Joe Kucinski
10 Great Toyotas That Could Have Been Lexus Models
Joe Kucinski
Thread Starter
Lexus Fanatic
iTrader: (13)
Joined: Jul 2003
Posts: 10,681
Likes: 9
From: Tulsa, Oklahoma
Dennis,
cool cool - I will go with the 2 so we can
together!!
Now one other question. If I just splice this bad boy in and keep it off, it won't affect my car at all right>? I ask this because I will be installing it at home, and then driving to the dyno place for them to tune it.
So I will be ok right as I know absolutely nothing about the settings.
Lemme know man,
Peace,
Jonny
cool cool - I will go with the 2 so we can
together!!Now one other question. If I just splice this bad boy in and keep it off, it won't affect my car at all right>? I ask this because I will be installing it at home, and then driving to the dyno place for them to tune it.
So I will be ok right as I know absolutely nothing about the settings.
Lemme know man,
Peace,
Jonny
correct. It should not but just in case there is any settings stored in your S-AFC unit I would initialize according to the manual. This will erase any settings that was on it previously.
Thread Starter
Lexus Fanatic
iTrader: (13)
Joined: Jul 2003
Posts: 10,681
Likes: 9
From: Tulsa, Oklahoma
Originally Posted by VSsc400
A/F signal out = pink
A/F signal in = orange
so like I said in the original thread, use brown, black, pink, orange, grey, green and red
tape up white, yellow pink and blue and don't use them.
A/F signal in = orange
so like I said in the original thread, use brown, black, pink, orange, grey, green and red
tape up white, yellow pink and blue and don't use them.
You said to use the pink and then below you said to tape up the pink. I am confused again!!
Please help,
Thx man,
Jonny
Originally Posted by Dx3
On the T7-A I only have one air flow signal. So do I use the pink or the orange for it??
You said to use the pink and then below you said to tape up the pink. I am confused again!!
Please help,
Thx man,
Jonny
You said to use the pink and then below you said to tape up the pink. I am confused again!!
Please help,
Thx man,
Jonny
Thread Starter
Lexus Fanatic
iTrader: (13)
Joined: Jul 2003
Posts: 10,681
Likes: 9
From: Tulsa, Oklahoma
Originally Posted by VSsc400
you use both pink and orange for the air flow sgnal. One for in and one for out. Use the picture.... sorry if I'm not explaining it right.... but the picture shows you how to hook up the pink and orange wires to one air flow signal
I don't understand how they all connect together. What is the difference between this and the ground wires that you put both on the one ECU wire?
Will this mean I will have to cut my ECU air flow wire?
Thx man,
jonny
Last edited by Dx3; May 16, 2005 at 07:27 PM.
Originally Posted by Dx3
OK, now I see where I was going wrong. So did you use these connectors or did you jsut use the no-cut taps that you used for the rest of them??
I don't understand how they all connect together. What is the difference between this and the ground wires that you put both on the one ECU wire?
Will this mean I will have to cut my ECU air flow wire?
Thx man,
jonny
I don't understand how they all connect together. What is the difference between this and the ground wires that you put both on the one ECU wire?
Will this mean I will have to cut my ECU air flow wire?
Thx man,
jonny
i used the connectors that came with the S-AFC package for the ECU A/F wire
the rest i used vampire clips
what's the difference? I don't know but I don't care to find out