Thread: amigo fault reset

I had the same thing, I think when they reset by themselves a hard code is not generated, but it haapen often then it set a code? others with more knowledge would be able to confirm this.
I have a dicky left front wheel sensor, I reset it, drive all day, then tun a corner and brake and it throws 2 amigos which them turn to 3 amigoes.

There's two types of faults that can be logged, intermittent and persistent. I think if it's intermittent and is "in fault" when restarted then while it's logged in the ECU it doesn't flag the lights where as a persistent fault is always seen by the ECU (always in fault state) and the lights will show.

The nanocom log shows if it's intermittent or persistent. I currently have a doozy where what was an intermittent fault has become persistent after changing the part but the symptoms of the fault have disappeared.

Intermittent faults in the ABS are usually a faulty sensor or even just dirty. Just remove (one bolt) and clean. There's usually a heap of dry grease and some metal bits in there(it's a magnetic sensor so it sticks). It can also be a wheel bearing, which while is an easy fix isn't as cheap as earlier models.

The dash lights dont remain constant until the magical 254 times is counted,they self reset until then.Its a binary computer number Im told.
,interestingly my CAT graders magical number is 127 counts for a fault code.
Check your disc rotors for thickness wear,I was getting constant issues with the 3 Amigoes,always front right when turning.I just replaced all the rotors/pads,early days but sofar they are on holidays The old rotors had a big lip,the front right was worst.
GOODLUCK
Andrew

Originally Posted by LandyAndy

The dash lights dont remain constant until the magical 254 times is counted,they self reset until then.Its a binary computer number Im told.
,interestingly my CAT graders magical number is 127 counts for a fault code.
Check your disc rotors for thickness wear,I was getting constant issues with the 3 Amigoes,always front right when turning.I just replaced all the rotors/pads,early days but sofar they are on holidays The old rotors had a big lip,the front right was worst.
GOODLUCK
Andrew

It just depends on how the manufacturers decide to set the fault code. In both cases they are probably using an 8bit word.

If you look at the binary representation it makes more sense:

2^8 = 256 (or 0-255)
2^7 = 128 (or 0-127)

Code:

0 = 0000 0000

127 = 0111 1111
128 = 1000 0000
      ^
     bit 8

254 = 1111 1110
255 = 1111 1111

CAT is probably reading bit 8 to determine if a fault is permanent.
On the D2 a fault count of 255 represents a permanent fault. The 254 will be he number of non-permanent faults prior to permanent fault status.

Getting back to the original question, I've read reports of the Nanocom displaying no fault codes, but when the same vehicle is connected to testbook or similar gear there are in fact codes logged.

On thing I found with old versions of the firmware was that saving the faults to file sometimes showed hidden fault codes. Might be worth trying out?

cheers
Paul

Originally Posted by OffTrack

Getting back to the original question, I've read reports of the Nanocom displaying no fault codes, but when the same vehicle is connected to testbook or similar gear there are in fact codes logged.

On thing I found with old versions of the firmware was that saving the faults to file sometimes showed hidden fault codes. Might be worth trying out?

Interesting comment Paul. When I got the car serviced the other week I asked the mechanic to look at the Auto Box as there were a number of minor niggles, which were traced to the XYZ switch, which is slowly on the way out. Though there were no codes appearing on the Nanocom, he said there were a number when he used his system, which he cleared.

Cheers

Steve

Faults may be logged as intermittent or persistent.

Intermittent are recorded as having occurred and are displayed (at least by nanocom) as when by time and date.

Persistent are evebts that have either occurred and are still recorded as present or have passed over the 256 event horizon and are logged as a persistent fault.

Just on the subject of fault codes on ABS and Nanocom
I have both a Hawkeye and a couple of Nanocoms one Nanocom is permanently wired into the car.
There are times that I have had ABS faults that the Nanocom didn't seem to clear.
The Hawkeye seems to do things differently with a reset of the ECU before it clears the faults.
The Hawkeye seems to be more reliable in actually clearing the faults.