ABS Fault??

[terranosaurusdoug]

Hi guys, it feels like my abs is kicking in at low speeds, there is no warning light showing, but there is probably plenty of mud covering brake components, any advise on what to do?
I thought it might be worth pulling abs fuse out incase it gets worse and causes an accident, tbh I would like to get rid of abs completely, don't really need it and it takes up useful space in the engine bay

 

[macabethiel]

Most likely mud on the reluctor rings on front hubs.

Or rust!

 

[jims-terrano]

Reckon you’ll have to steip brakes and give them all a good seeing to whilst you’re there. Also check the nsf abs cable where it goes into a thicker rubber section. Wires inside tend to break, normally feel very flexible where it’s broken.

 

[elty001]

Like Jim says the NS front is prone for the cable breaking.
Done the repair on both terranos I've had with ABS.

 

[glen]

ABS

Here's a step by step guide posted by another member a while back...

REPAIRING SENSORS (1.1ohms to 1.3 ohms off the top of my head)
The sensor is a problem on T2 See below

REPAIRING SENSORS

your old sensor can easily be repaired the sensor very rarely goes wrong its the wiring that connects it that breaks down and can be replaced by a competent DIY person or an auto electrician with very little kit needed you need a multi-meter a soldering iron and solder some heat shrink (resin sealing is best) and some cable.

1. Too find the faulty sensor jack up and support the front of the vehicle on axle stands and remove the front wheels.

2. disconnect both front sensors from behind the rubber splash guard (follow the cable to the chassis) and unbolt the brackets that hold it to the suspension (do not remove the sensors from the hub as they will be rusted solid and you will damage them getting them out )

3. switch on your multi meter and set it to ohms connect the two leads to the two connectors inside the plug of the sensor lead (it doesn't mater which way round ) you should get a reading (1.1 ohms ~ 1.3 ohms off the top of my head) get some body to hold the plug and multi-meter leads while you wiggle the cable if the reading on the multi-meter changes that is the faulty sensor you may have to bend the cable quite tight to find the broken wire its usually in the last bit of protective sleeving (rubber hose ) before the sensor.

when you find the faulty one lay it on a piece of cardboard and mark the positions of the sleeving and the brackets as you will need to remove these and put them back on later you can prise the metal brackets off with a screw driver and after cutting the plug off the end of the sensor lead (leave a bit of cable to reconnect it) you can slide the sleeving off with a bit of wd40

cut open the protective casing of the twin core cable and strip it back revealing the two cables work your way to the sensor you will probably see the broken wire just after the break cut the cable and find a length of new cable of the same size (this is important) there are plenty of car electrical shops that will help you solder the new cable onto the sensor and cover the join with heat-shrink i use one that seals its self with a resin when you shrink it to make it water proof then cover both cables in heat-shrink to form another protective layer and replace the rubber sleeving and support brackets and solder the plug back on the end and use heat-shrink to seal it again reattach the support brackets and reconnect the plug replace the wheels and the job should be done make sure you check both sides as they may have both gone.

when you test it switch on the ignition and start the engine the light will come on for a few seconds then go out the pump under the bonnet will hiss once then stop road test the vehicle the light should stay off and the pump should not hiss under the bonnet.

hope this helps if not you will have to search the breakers for a second hand one which may not be in any better condition and they are as rare as rocking horse pooh trust me i have looked for one!

another thing that can effect it is the slotted ring that turns with the front hub the sensor has a magnet inside it and when this slotted ring turns it senses it and tells the abs Ecu the speed at which the wheel is turning the Ecu monitors all the wheel speeds if the abs senses that a wheel is about to skid it turns the brakes off it activates the abs mode on that wheel. The trouble is the slotted ring gets clogged with mud grease and metal fillings from the brakes and the sensor is fooled into thinking the wheel is skidding.

POWER SUPPLY FUSES
Check fuses, 21-10amp, 25-10amp, 28-10amp, 49-20amp and fuse 50-10amp these are power supplies to NATS and the ECM.

Glen

Also worth attention...........

Not sure about Patrol half shaft details, but on the Terrano there is (or should be) a snap ring that fixes the half shaft position to the hub, if not there the shaft can float, possibly allowing the reluctor ring to move out of the range of the sensor.

Brian

 

[elty001]

Top find Brian:thumb2

 

[macabethiel]

Like Jim says the NS front is prone for the cable breaking.
Done the repair on both terranos I've had with ABS.

I would expect a broken cable to put the ABS light on ?
If the ABS is tripping in early in my experience it is linked to the ABS sensor being given fake signals by the reluctor ring due to mud or rust build up. This is specially true at low speeds - below 10 mph.

 

[elty001]

I would expect a broken cable to put the ABS light on ?
If the ABS is tripping in early in my experience it is linked to the ABS sensor being given fake signals by the reluctor ring due to mud or rust build up. This is specially true at low speeds - below 10 mph.

On the terrano it puts the light on and like you say it kicks in at low speeds.
Gives the same symptoms as a duff sensor or brocken/clogged reluctor ring.

 

[terranosaurusdoug]

Hello peeps, so I still have a problem with abs, I thought it was dirt at first as when I jet washed the the front brakes it cured the problem for a while. It's been doing it again for a few days so today I took some advice and gave the nsf abs wire a vigorous wiggle and went for a drive, cured problem so looks like I need a nsf abs sensor as suggested :thumb2

I'll probably be needing the guide above then

 

[Mav96]

More likely just needs the wire replaced, those sensors do not like coming out.
Try cutting the cable about 4" from sensor & solder a new length in.

 

[Banshee]

More likely just needs the wire replaced, those sensors do not like coming out.
Try cutting the cable about 4" from sensor & solder a new length in.

What he said!!!!

If you get it majorly wrong Doug, I've got a whole hub with sensor fitted if you need one? from past experience, they really really do not come out!!!!!!!!!

 

[Banshee]

This hub was scrapped after this picture was taken, I just couldn't get it all out, it was a pig of a job and I've heard when it is clean, getting the new one to stay put is as big of a challenge

 

[terranosaurusdoug]

This hub was scrapped after this picture was taken, I just couldn't get it all out, it was a pig of a job and I've heard when it is clean, getting the new one to stay put is as big of a challenge

WOAH, that looks horrendous, advice taken guys, the wire it is :bow

 

[solarman216]

I have managed to extract two, but the second one when tested failed although it tested good when in, this was from scrap hubs trying to salvage sensors, rears are no problem as in oil, Rick

 

[Banshee]

I have managed to extract two, but the second one when tested failed although it tested good when in, this was from scrap hubs trying to salvage sensors, rears are no problem as in oil, Rick

The oracle is correct as always :naughty

 

[elty001]

Just out of interest Doug had you done a fuel filter change before the abs started spazzing out?
Only asking as I spilt diesel on my plug and that threw it into mong mode until I cleaned it out with contact cleaner.

 

[terranosaurusdoug]

Just out of interest Doug had you done a fuel filter change before the abs started spazzing out?
Only asking as I spilt diesel on my plug and that threw it into mong mode until I cleaned it out with contact cleaner.

Now then you've got me thinking, I changed all the filters a week or so before I last went away with caravan, and I remember thinking that it was typical that abs started playing up just before I went so it's possible, I'll check plug tomorrow, might have some quality time with a multi meter too, cheers bud :thumb2

 

[elty001]

worth a look before you start stripping things down:thumb2