ECU Pinout questions.. trying to track down the ABS feeds to the Syvecs ECU...

[Mike B]

Hey everyone..

 

need help identifying the abs feeds

 

Ryan has done a sterling job fitting out the car with the Syvecs, but when I got home I decided all the other controllers that had been bypassed were coming out, and believe me there was a lot. Taking the controllers out was one thing, but the birds nest of wiring took me a day to strip. Between RLTC, Nitrous (never used by me) water injection, more hks redundant wiring that you can imagine, I pulled shed loads of it out (as carefully as I could!). It's now good and tidy, but did fear that I could have snipped something critical...

 

thankfully car started on the nose, but did throw up an ABS warning..

 

Syvecs softwear tells me that it is getting no feed from the front left wheel, so I need to check the wiring back from the ecu to find the break or determine if the sensor is duff (I had pulled all cam adjusters off the suspension and may have disturbed a sensor). Trouble is, I cant find which wires are the abs feeds. Ryan is working in Greece for a few days, so not cannot be sure which pins he used on the SG6 ecu install, but If I can track it down using stock loom then I'm in.

 

The trouble is that this loom (see pic) looks nothing like the vvti pinout diagrams I have pulled off the site and used before...?

 

so can anyone tell me if there is a pinout diagram for the VVTI looms in the pic, or any good suggestions as to how I find the abs feeds?

[Wez]

You could have a look in the Syvecs software to see what pin Ryan assigned the feed to and then trace the wire back from loom.

 

Also, from memory the ABS wheel speed sensors are connected via a small signal box which Ryan would have also installed, normally using the same wire as that bright orange stuff, the wires should run from the Syvecs via the converters into the ABS ECU that sits behind the stereo.

 

This is on a normal JSpec so may be slightly different.

[Mike B]

You could have a look in the Syvecs software to see what pin Ryan assigned the feed to and then trace the wire back from loom.

 

Also, from memory the ABS wheel speed sensors are connected via a small signal box which Ryan would have also installed, normally using the same wire as that bright orange stuff, the wires should run from the Syvecs via the converters into the ABS ECU that sits behind the stereo.

 

This is on a normal JSpec so may be slightly different.

 

I wondered what that white box was for! (no I did not cut it out!)

wez -- where on the syvec sorftwear would it tell me what pin was assigned to abs??

I have looked but could not find...

 

hence I thought I could track it from the other side - the stock loom...

 

also - on syvecs, in wheel speed on Smon

what's the difference between

rlspeed

and

rlspeedv

 

presume it's;

 

rear-left-speed (increases and decreses with actual speed)

and

rear-left-speed-voltage (stays at 5v at idle)

 

but how does the ecu use this?

[Wez]

In the Syvecs software under IO Configuration / pin assignment you should see what the wheel speed sensors are assigned to, ie AN8 on my screenshot, then using the pin assignment sheet for an S6GP from the Syvecs website you can locate the pin on the loom.

 

 

rlspeed will be calculated speed and rlspeedv will be raw voltage readout, im not 100% sure but I think the ABS sensor might be waveform based and therefore the voltage may not change even though the signal does, if that makes sense.

[Wez]

There is a shed load of other configuration options under sensors for speed, personally I would leave that to Ryan

[Mike B]

Ahh.. now that is making sense..

I'll track those down and start looking.

I notice that on yours front wheels are both clagged on together, meaning that he's used only one input for both, so your abs system has 3 feeds?

What is interesting on mine is that I have a feed voltage for both rears, but for one of the rears but when I drive the ecu does not calculate a speed for it.. It does on one and not on the other which is curious!

I need to check on mine to see if he has done the same...

 

There is still an abs ecu on the car right? and this will take feeds from these sensors too and also bring lights onto the dash when not working?

 

I could still do with identifying the wires out of the stock loom so that I can test all 4 sensors for output, as if the stock ecu is using all 4 there is potential that I can make it happy but the stock ecu will still throw up.

 

Thanks wez for spending the time to enlighten me, it is much appreciated! Syvecs is a very impressive bit of kit, a real learning curve, and as frustrating as it can be I am enjoying learning more about the way the car works...

 

I'm also getting a fuel pump voltage warning, which is odd as the car runs fine.. I'll be looking at that next session too. It's fantastic to get the car cleaned out and all the old wiring removed.. well worth the price of a few niggles - it was a right mess before.

[Wez]

I think he may have done that on mine as one of the sensors was playing up and causing the TC to cut in, there was too much noise.

 

The stock ABS sensor should still be in place and used unless you have removed the ABS all together.

[Mike B]

Hey Wez,

I found the pin assignments, and it looks like mine is the same as yours, front wired in on only one wheel;

So I can forget the front left wheel issue as it is not connected... but it may be the rear wheel.. see this shot;

rrspeedv is in line with the other readings, but rrspeed is not there, which suggests a break in the signal wire in the rear right abs sensor (or failure of the unit).. you think?

 

Also, can you take a look at this for me?

I'm getting an engine warning on the fuel pressure;

Car runs and idles fine, but I have not taken it out and loaded it (besides probably in safe mode anyway) but how do these numbers stack up against yours?

[Mike B]

BTW, once understood, this syvecs system looks like it is a mine of information about what the car is up to... the more I understand the more impressed I am...

[Ryan.G]

Hi Mike

 

Back in UK now

 

On Some of the Installations with all the sensors fitted there just isn't enough inputs to get all 4 wheels speeds so you can use just one of the fronts for the reference speed and carefully configure the Lat G TC tables.

 

If you are not getting a RR speed value then that will be the issue with the ABS light and it needs to be resolved for TC to work on the S6.

 

Great you are getting involved though and hope the manual has helped.

 

With regards the Fuel pressure error the sensor wiring needs to be check. Check there is a 5v feed to Sensor, Ground and then a 0-5v signal output. With engine running it will be around 2volts IIRC.

 

The Signal from Fuel pressure goes to pin59 on the S6GP connector on your install. Not always the same for every install for anyone else reading this.

 

I would not take it out without fixing these issues as the Relative trip will be present at limit DBW opening and Rev Limit.

 

Ryan

 

Hey Wez,

I found the pin assignments, and it looks like mine is the same as yours, front wired in on only one wheel;

[ATTACH=CONFIG]152148[/ATTACH]

So I can forget the front left wheel issue as it is not connected... but it may be the rear wheel.. see this shot;

[ATTACH=CONFIG]152149[/ATTACH]

rrspeedv is in line with the other readings, but rrspeed is not there, which suggests a break in the signal wire in the rear right abs sensor (or failure of the unit).. you think?

 

Also, can you take a look at this for me?

I'm getting an engine warning on the fuel pressure;

[ATTACH=CONFIG]152151[/ATTACH]

[ATTACH=CONFIG]152150[/ATTACH]

Car runs and idles fine, but I have not taken it out and loaded it (besides probably in safe mode anyway) but how do these numbers stack up against yours?

[Mike B]

Perfect - thanks Ryan.

Yup, I'll get the volt meter out and check the RR abs - I think the problem may be the sensor on the hub, as I had to rip all the lower link arms off, and the hub was moving around a lot - wire may have been disturbed.

 

Also - fuel pressure - I took out all the sp gauges (fuel, water and oil), tracked their wiring back to the aftermarket sensor feeds that came in from the engine bay and removed them. It's possible you used the aftermarket f/p sensor I have into the syvecs? I had assumed you used the one in the stock loom... Now I have the pin I will track back...

 

The car will crab to the alignment shop first, for geo - I replaced and lubricated all cam adjusters.

Manual for syvecs is very good - I am just starting to learn - time is the issue. If I ever bought another car, I would be tempted to put this ecu in just for the sake that you have control and diagnostics over all that happens with it. I struggled with this MKIV on HKS locked map and no access to mapping softwear for years. Blindly fumbling around with niggles I could neither diagnose, pinpoint, or cure... so frustrating.

[Mike B]

Fuel issue - sorted - I had chopped out the aftermarket FPG, the syvecs was wired to it.. plumed it back in, hey presto, happy ecu.