Jump to content
SAU Community

Recommended Posts

Hi all, I think this is my first real post. Anyhoo, my G sensor started playing up and I had error code 13 with both the ABS and 4WD lights on my dash on. I decided to pull it apart and fix it rather than buy a new one. I'm a Digital Electronic Engineer but I think anybody could do this.

I started by pulling the G sensor out of the car, removing all the screws from under the bottom of the sensor and pulling the plugs off the top of the sensor to make it easier to work on.

After I pulled the sensor apart the first thing I noted was that an electrolytic capacitor had been leaking which had caused some corrosion on the PCB. I replaced the leaking caps, cleaned everything with PCB cleaner and remounted the sensor back in the car _without_ the metal housing on.

After stating the car (in neutral on a level surface) I noted the three output voltages (see attached pic). One of mine was 2.53v the others were in the 2.20~2.31 volt range. I then adjusted the calibration pots (again see pic) so that all the output voltages were exactly 2.50volts (netural for the ATTESA computer). I shut the car down, restarted and abracadabra no more ABS and 4WD lights.

FYI if you blow something up or damage anything following this it's not my fault!!

Apologies if this is already up on the forum somewhere (I couldn't find it)

Link to pic - https://www.facebook.com/photo.php?pid=6875962&l=54a7f3bd68&id=616436020

Jeff T

  • Like 2
Link to comment
https://www.sau.com.au/forums/topic/356654-r32-gtr-g-sensor-fix/
Share on other sites

Good job!! that should point a few guys in the right direction as I usually just tell em to check the g sensor for the indicator bar to see if it's stuffed.

Had the same issue with a guys computer in his honda lol, leaking caps caused car not to start, replaced them and good as new.

Let me know if the fix works for you too :-) I did this on an R32 GTR VSpec not sure if all the other GTR's (R33's and R34's) are the same or not...

Jeff T

Edited by datsun_1600
  • 2 months later...

I am having the same problem, error code 13 fore and aft g sensor.

I will certainly give this a go. The funny thing is the car was kept off road in the winter and when I first started it up 4wd worked fine, then after a few hours went back to 2wd mode with the abs light kicking in. I did notice that the voltage was a little lower as per the first post.

I hope this works. Many thanks.

  • 3 weeks later...

did this today.. my pin 2 (2.63v) pin 5 (2.67v) pin 6 (2.60v)

i couldnt adjust these any lower as it switches to ~1.64v and abs light comes on

am i missing something?

If it's jumping from 2.67ish to 1.64 then you might just be turning the pots the wrong way. They can be turned 360deg and the bottom say 60 deg is just open so the voltage will jump. When I get my butt into gear I'm going to post a replacement pot that can be loaded that will allow a larger range so units that are a bit out of whack can be fixed still.... Just got home from a couple of weeks on the road, so hopefully in the next few days i'll pull my unit out and work out a replacement part that can be loaded. (FYI only a few bucks each (or maybe cents) for replacement pots)

Jeff

  • 2 months later...

Hey sorry for the delay. Some of the equipment I design is used in the shuttle launches and I was invited by NASA to go to the last one. I get back to Aus on the 6th of Sept so i'll have a crack at it then. I haven't forgotten!!!! I'm also in the process of building a replacement with today's modern IC's, but lol i get busy with work so i have no idea when that will be done. Funny that about $20 bucks worth of today's IC's can replace a $$$$$$$ unit. Jeff

Not wrong I cant believe the price they charge for the new one when you consider whats in them. My mechanic who specialises in GTR's spoke to the local dealer and said he was lookign for one and when he was told the price he laughed and said you mustnt sell many of them and the guy said no they dont fail that often, at which point my mechanic let fly with a few choice words and said they fail all the time its just that no one is prepared to pay for a new one.

Yeah totally. Hopefully when I get a spare moment i'll finish off my idea for a new module and make the project open source etc so everyone can have it. Using a Bosch Sensortec BMA180 G sensor, Altera Cycline II FPGA, (not sure which DAC yet), JTAG etc etc etc. Another trade off is if you wanted you can play with the four wheel drive bias characteristics. I have the IC's but haven't done the PCB yet. lol i'll get to is sometime soon I hope... Hard to get motivated a bit coz I work with electronics all day at work, the last thing I want to do it work on electronic stuff after work too lol.

Jeff

What would help motivate you? Couple drinks? a Pleasure woman? lol

Heck if donations would help you feel good I'm sure many around would donate just for the ability to get a design made.

Keep up the good work. Always good to see alternatives being built locally by skilled people. Always appreciate the efforts of those who have skills I don't =)

Bah just lost my last post...

Some testers in the Adelaide area (R32 GTR required) would be helpful. Better yet a track day or something (safer). I need to gather info from the factory system to calibrate mine, so I have to download info with a laptop after a few laps (hard, med and slow, and even grandma driving). I have all the components in now, just need to do the PCB when I get back home...

Jeff

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...