Attesa cousins
So, in my last post I was getting confused as to which set of ATTESA ETS codes are used by an R34 GT FOUR sedan, as it seemed to be contrary to what the factory shop manual said.
I did some more research after responding to a request for help from a post on sau.com.au from a guy with a Stagea, and I ended up getting a look at a Stagea workshop manual and wiring diagrams.
Seems that there are a few variants of the ATTESA ETS system across Skylines/GTRs/Stageas.
The Series 2 Stagea (with the NEO engine) is very similar to the R34, which is really no surprise. By similar I mean that the wiring looks almost the same, error codes ARE the same as my Sedan GT-Four, but there are a few interesting points to note.
The S2 Stagea and R34 GT Four both appear to have a 3-axis G sensor, whereas S1 Stagea and older Skylines (R33 GT4 perhaps, and R32..?) only have latitudinal and longitudinal G sensors. You can tell by the differences in the wiring diagrams, there is an additional sensor (still inside the one box) and more wires in the later models.
So what effect does this have?
In my GT Four I had noticed something strange that I thought was a fault, every time I turned a particular corner and accelerated, the SLIP light on the dash would illuminate. This normally only happens when one wheel loses traction, which the ETS control unit would pick up from the 4 wheel speed sensors. The response of the ETS system to this seems to be additional front-torque.
But this was not happening around this particular corner, I could use any level (ie low) throttle, and the SLIP light would come on, even when I had exited the corner and straightened up the car. What was happening???
Then it dawned on me.
The corner is followed by a steep drop-off.
I believe it is actually the drop-off being sensed by the vertical g-sensor, causing the ETS system to add additional front drive to stabilise the car. Now I need to go and read up about the first time this was added to the GT-R system, to see what they say about it.
I did some more research after responding to a request for help from a post on sau.com.au from a guy with a Stagea, and I ended up getting a look at a Stagea workshop manual and wiring diagrams.
Seems that there are a few variants of the ATTESA ETS system across Skylines/GTRs/Stageas.
The Series 2 Stagea (with the NEO engine) is very similar to the R34, which is really no surprise. By similar I mean that the wiring looks almost the same, error codes ARE the same as my Sedan GT-Four, but there are a few interesting points to note.
The S2 Stagea and R34 GT Four both appear to have a 3-axis G sensor, whereas S1 Stagea and older Skylines (R33 GT4 perhaps, and R32..?) only have latitudinal and longitudinal G sensors. You can tell by the differences in the wiring diagrams, there is an additional sensor (still inside the one box) and more wires in the later models.
So what effect does this have?
In my GT Four I had noticed something strange that I thought was a fault, every time I turned a particular corner and accelerated, the SLIP light on the dash would illuminate. This normally only happens when one wheel loses traction, which the ETS control unit would pick up from the 4 wheel speed sensors. The response of the ETS system to this seems to be additional front-torque.
But this was not happening around this particular corner, I could use any level (ie low) throttle, and the SLIP light would come on, even when I had exited the corner and straightened up the car. What was happening???
Then it dawned on me.
The corner is followed by a steep drop-off.
I believe it is actually the drop-off being sensed by the vertical g-sensor, causing the ETS system to add additional front drive to stabilise the car. Now I need to go and read up about the first time this was added to the GT-R system, to see what they say about it.
Hi mate, are you still active on here? After information on how you retrieved atessa codes! Thanks!
ReplyDeleteHi there - yes still active from time to time.
ReplyDeleteHave you read this post? https://enr34.blogspot.com/2017/08/diagnosing-attesa-ets-codes.html - it has a method to get the Attesa codes to blink on the ABS light on the dash, only applicable to particular models though. What model do you have?