Thread: 254 faults logged=3 Amigoes

Yep, use to get it all the time. But Ive not had the guys turn up for three weeks now, (and counting) touch wood.
Im not sure if I got it after the new software loaded. I dont get the wheel speed error.
The other change Ive made, was a complete flush of the brake fluid. I now use "Castrol Brake Fluid Response, super DOT 4. ( I think I might have said before it was dot 5. my bad) I also ran a power bleed with Nanocom. After doing this, the three Amigos would show up less and less.

But back to "254" how many teeth are on the ABS rotors in the hubs ?

"" Im wondering if 254 is the trigger point for the 3 amigoes to illuminate???
Anbody else found 254 faults whilst clearing faults??? ""

Yep! I'm pretty sure I have a dodgey ABS wheel speed sensor cable. FLHS. Pulling up at an intersection, whilst turning/veering left, off she goes. Ding Ding Ding and the 3 Amigoes come visiting. Stop & restart the car and the fault dissapears. I've checked with the Nanocom immediatley this fault happens, and there are NO faults logged in the ABS-SLS ECU.

THEN we'll strike the same situation/conditions to trigger the 3 Amigoes, but FOUR lights come on ... Ding Ding Ding .... stopping & restarting the D2a doesn't clear the fault. Connect the Nanocom and I get an "Intermittant signal front left hand wheel speed sensor 254 times". Takes the Nanocom to read & clear this fault.

Soft Fault - Fault triggered, but resettable by a stop/restart.

Hard Fault - Fault triggered for the 254th time since last clearing the ABS ECU, fault lights register and can only be cleared by an ODB port connection of the required diagnostic equipment (ie; Nanocom, Testbook, etc ...)

I've just changed my front & back disc pads and am getting a little more front brake squeel than before on the old pads (Lucas stamped on the back plate of the old pads) ... which seems to be setting off the 3 Amigoes more often ... same outcome as outlined above. New pads are Transgold Kevlar/Semi-Metallic. They seem to work well, with good stopping power ... but with extra squeel & Amigoes .... time to replace that ABS wheel speed sensor, or find and fix the intermittant cable break.

Kev..

Hi Fluids, What firmware version are you running on Nanocom ? 2.04v or 2.05v.

There are 60 teeth on the ABS hubs.

its a computer guys. binary counting and storing of numbers.
"The allowable range for N is 0-254 and for the count field it is 0-N"
my guess once the count hits max it triggers the warning lights.

Originally Posted by Fluids

"" Im wondering if 254 is the trigger point for the 3 amigoes to illuminate???
Anbody else found 254 faults whilst clearing faults??? ""

Yep! I'm pretty sure I have a dodgey ABS wheel speed sensor cable. FLHS. Pulling up at an intersection, whilst turning/veering left, off she goes. Ding Ding Ding and the 3 Amigoes come visiting. Stop & restart the car and the fault dissapears. I've checked with the Nanocom immediatley this fault happens, and there are NO faults logged in the ABS-SLS ECU.

THEN we'll strike the same situation/conditions to trigger the 3 Amigoes, but FOUR lights come on ... Ding Ding Ding .... stopping & restarting the D2a doesn't clear the fault. Connect the Nanocom and I get an "Intermittant signal front left hand wheel speed sensor 254 times". Takes the Nanocom to read & clear this fault.

Soft Fault - Fault triggered, but resettable by a stop/restart.

Hard Fault - Fault triggered for the 254th time since last clearing the ABS ECU, fault lights register and can only be cleared by an ODB port connection of the required diagnostic equipment (ie; Nanocom, Testbook, etc ...)

I've just changed my front & back disc pads and am getting a little more front brake squeel than before on the old pads (Lucas stamped on the back plate of the old pads) ... which seems to be setting off the 3 Amigoes more often ... same outcome as outlined above. New pads are Transgold Kevlar/Semi-Metallic. They seem to work well, with good stopping power ... but with extra squeel & Amigoes .... time to replace that ABS wheel speed sensor, or find and fix the intermittant cable break.

Kev..

Squeeling brake pads will cause the 3 amegos to appear. After a couple sets of different pads, I put in a set of the LR genuine pads [now made in India]- funny shape, no squeel, no amegos, no 254!! In my case it appears that the resonance in the squeel causes the amegos to appear.

Tony

Originally Posted by Zute

Hi Fluids, What firmware version are you running on Nanocom ? 2.04v or 2.05v.

There are 60 teeth on the ABS hubs.

2.05

Kev..

254 is easy enough to explain...

This is what I suspect is happening:
Count of event is stored in an 8-bit address which can hold the values 0 to 255. However there is most likely a control single event in storage which means it never really gets to zero and this reduces the maximum value to 255 - 1 or 254. This could be because the first event logged is the clearing or connection of the unit and so it is ignored.

So once it gets to 254 its full up and thus logs a permanent fault.

There is a second and even more likely reason. Again assuming 8 bit storage with the first bit reserved for a higher purpose. Each time an event occurs a bit is set from 0 to 1. So you go from 00000000 to 11111110 meaning 7 events have been logged. When the 8th event is logged the last bit is set and the 3 lights come on.

If you want I can go into 2's compliment addition and binary shifting which may also explain this, but I suspect you don't want that so I'll go open a Pale Ale instead

Originally Posted by Grumpy

Squeeling brake pads will cause the 3 amegos to appear. After a couple sets of different pads, I put in a set of the LR genuine pads [now made in India]- funny shape, no squeel, no amegos, no 254!! In my case it appears that the resonance in the squeel causes the amegos to appear.

Tony

Yessireee ... that squeal/resonance = Vibration, which radiates outwards through all solid parts of the wheel/axle/brake assy ... which by my estimation, causes the ABS sensor wire to vibrate at a high frquency ... causing the break in the ABS cable to vibrate and send a fault off to the 3 Amigoes ! ...

Anyone tried any of the aftermarket anti-squeal products for disc pads ?? Seems they are spray on / paint on ... the back of the pads. Supposed to dampen the disc pad to help prevent vibration .... or are they just smoke & mirrors ?

Kev..