Input B9

confUsed · Post by **confUsed** » Mon Apr 20, 2009 3:03 pm

I tried wire in a switch for fts today. I found that there was a switch on the clutch from the factory, which was wired into B7 for some reason. I have already cut that wire and used it for ebc control, so I just wired the switch in to b9. When the clutch is pressed down, b9 is now grounded. When lift my foot from the pedal, its not grounded. But I cant get any reaction in ectune when I look at the sensor data. Are there any bugs that I'm not aware of?

confUsed · Post by **confUsed** » Mon Apr 20, 2009 3:57 pm

So I have been searching through the manuals, and found that B9 needs to be wired to +12V to get signal, is that right? What about B8, ground or +12V (couldnt find it)?

Post by **Gaskleppie** » Mon Apr 20, 2009 5:00 pm

B9 is the brake switch input, right? That one has to get 12v to be activated.

Post by **nate** » Mon Apr 20, 2009 10:53 pm

Anyone want to volunteer to update the wiki with this information? A good place would be under http://wiki.ectune.com/index.php/GPO

confUsed · Post by **confUsed** » Wed Apr 22, 2009 3:19 pm

I tried to figure this out today, but I havent found the solution. Working under the dashboard gets frustrating in the long run, so I figure I should continue this thread. Help is much appreciated! B9 is the starter signal. When I wire it to +12V, I get signal, but the fuel pump turns on (and stays on), so obviously I cant use that. B8 is the power steering pressure switch. I checked the wiring diagram, and I even followed the wire out to the switch, and found that it needs to be grounded to get signal. Problem is I get NO reaction when I wire the input directly to ground. B5 and B7 are in use, and works flawlessly (switched to ground) D2 is brake switch, but I need that one for my brake lights, and I guess I need D6 (vtec switch) too. So that leaves me with either B8 or B9, but I cant get any of them to work. Anyone used them succesfully before?

Post by **Gaskleppie** » Thu Apr 23, 2009 1:16 am

mm, B9 is the starter signal? Never used that one. But you dont need the brake switch to activate the brake lights. Its just a signal to the ecu. It can work perfectly without that one. So if you cut the D2 wire from the loom and connect you fts wire your good to go. Dont forget to isolate the old D2 wire. That one gives 12 volt when baking

RoadXY · Post by **RoadXY** » Thu Apr 23, 2009 3:38 pm

Gaskleppie wrote:mm, B9 is the starter signal? Never used that one.

Its connected by default. The ECU uses it already to know when youre priming the engine...

confUsed · Post by **confUsed** » Thu Apr 23, 2009 4:22 pm

Gaskleppie wrote:mm, B9 is the starter signal? Never used that one. But you dont need the brake switch to activate the brake lights. Its just a signal to the ecu. It can work perfectly without that one. So if you cut the D2 wire from the loom and connect you fts wire your good to go. Dont forget to isolate the old D2 wire. That one gives 12 volt when baking

ITs working now! I used the brake input d2 like you said and wired it to the switch (switch is fed with 12V). I have both brake lights and fts switch now! Thanks a lot

2bfi · Post by **2bfi** » Sat May 02, 2009 11:18 pm

I was playing with B8 today. With datalogging connected, and either KOEO or engine running, I brought up the Data window. The label PSP has no tick mark when B8 is floating and a tick mark when it's grounded. It works in my case. However, for my purpose the signal source was a float or +12V, and pin B8 won't be able to differentiate the two. I had to make a simple circuit to reverse the output. It requires a 9014 NPN Transistor and a 5.6K ohm 1/4W resistor wired as follows:

Connections are self explanatory. It works as follows: Input is on the left side and can have 3 states. Output is at B8. Input/Output Ground/Float Float/Float +12V/Ground This simple circuit can be adapted to other pins that require a ground to activate.

JaredKaragen · Post by **JaredKaragen** » Sun May 03, 2009 6:58 pm

and here I would have just used a relay

2bfi · Post by **2bfi** » Mon May 04, 2009 1:25 am

Using a relay was the first thing that came to mind, but for such a small amount of current it just didn't make sense to me. Solid state is hopefully more reliable. There's more that 1 way to skin a cat.

confUsed · Post by **confUsed** » Tue May 05, 2009 2:58 pm

2bfi wrote:I was playing with B8 today. With datalogging connected, and either KOEO or engine running, I brought up the Data window. The label PSP has no tick mark when B8 is floating and a tick mark when it's grounded. It works in my case.

I searched at pgmfi for info, and found others with the same problem as me, the B8 input is just dead. IDK, maybe some ecu's just dont have the hardware for it or something is different? I'm 100% sure that I got no reaction (no tick mark) when I grounded mine, so I guess I'm one of the lucky ones :p Its an edm p28, btw.

Post by **calvin** » Wed May 06, 2009 8:34 am

for b9 use i'll check the code now. It's possible to pump the fuelpump to always on and then use b9 starter signal. if my code it working correctly. If you select starter input the mem value is put to on. causing the fuel pump on constantly. and you can use the input for something else. I have a bench tester so i can test this later. on the list.. Now with the bench tester a lot of these can be fixed quickly!

Post by **calvin** » Wed May 06, 2009 8:40 am

can somebody put this on wiki? It would be great if all the user help with wiki.

2bfi · Post by **2bfi** » Thu May 07, 2009 9:16 pm

Unfortunately, if the car the ecu came from doesn't have a power steering pressure switch, chances are B8 won't work.