ABS & TC lights

URGENT ASSISTANCE REQUIRED!

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cortina
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ABS & TC lights

Post by cortina »

Can you help me? My pumas ABS & TC lights have come on on the dash and dont go out. I have checked everything important to there operation, but can not find a problem. Was wondrering if its electrical as it has (a) just been in the body shop after the wife tried to re-design it & (b) been in the garage for its MOT. Any help would be appreciated. Thanks
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Dal
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Post by Dal »

Welcome!

I assume by "I have checked everything important to there operation" you have checked the mountings are good (close to the castleated ring) and they have the correct resistance across them to ensure they haven't failed?

Maybe look and see that the cables from the sensors are in good condition as if they come out of their mountings, they can be worn by a tyre on full lock.

The fuse is ok in the central fuse box? (The one under the cubby hole to the right of the steering wheel) : Fuse 13, 15A - blue for the ABS.

Also check the related fuses in the fuse box under the bonnet:
fuse 30 - 3 amp ABS
fuse 31 - 30 amp ABS
fuse 33 - 30 amp ABS

To test the sensors:

1. Remove Wheel
2. Remove Inner Arch Lining
3. Unplug ABS Sensor
4. Set Multimeter to Ohms
5. Set Range so meter reads between 1000 and 1200 Ohms
6. Test the sensor plug LEADING to the wheel hub by going across the 2 pins
7. A good sensor should read between the values with an average of 1.1K Ohm
8. Anything else can point to coils breaking down
9. Remember to wiggle the sensor lead when testing to check the internal coils
10. Repeat if necessary on other side.

Good luck - let us know how you get on.
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Dal
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Post by Dal »

Just another thought : Can you hear the 12mph "graunch" of the ABS self test? Might need checking out servo wise. Try disconnecting the battery for 30 mins and starting again. Sometimes clears it, but can come back again though if the fault is elsewhere.
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P7TNY
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Post by P7TNY »

Dal your a clever man.......good guide there
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Post by Dal »

I try my best

:P
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Post by Jasper »

I have the same problem (and have done for some time) and it was traced to a faulty ABS sensor on the front. If you know a friendly AA man they have the diagnostic equipment to find out what's wrong.

I really should fix mine, the lights been on since Christmas.
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Post by e3silversurfer »

mine has been on for a while as well but 80 quid per cable is not motivating me to get it fixed :P
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Post by Dal »

You'll need to fix it for MOT time Elvin. Instant fail if there's a light on.
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Post by Cherie »

Got until July to sort mine out.

Might get around to having a look at it on Tuesday!
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Dal
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Post by Dal »

I'll lend you some tools then whilst I sort your other car out....
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Post by Cherie »

Fair enough. Just let me know what I need to do and I'll have a go.

You know me, I'll get stuck in and have a go at it at least. :-D
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Dan 1.7
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Post by Dan 1.7 »

Evening all,

I need some assistance with my 2001 1.7, I have what appears to be a common fault with these cars; the ABS and TC lights come on intermittently.

I have tried everything suggested on this and other posts-

Front sensors and castleated rings are clean.
All sensors are getting a reading 1.1ohms on the multimeter apart from the front right which starts at 2 and fluctuates down to 1.3ish.
All fuses are fine.
I have cleaned up the sensor face and castleaded rings in the rear drums.
No apparent damage to any wiring.

It does the 12mph self test but when the lights are on to indicate a problem I get a horrible grinding sound. Could it be that front right sensor?

Any suggestions greatly appreciated as the MOT expires on the 20th so need this sorted beforehand.

Dan :grin:
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Dal
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Post by Dal »

Sounds like your front right sensor is the culprit then.

If you take it to any decent garage, they'll be able to put a diagnostics tester on it to confirm.

Welcome along btw.
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Dan 1.7
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Post by Dan 1.7 »

Thanks for the welcome, found this site to be very useful when looking to buy my puma :grin:

Only garage I could find open on a Sunday was Kwik Fit who I would normally avoid using but needs must. They wanted £40+ Vat just to plug in the diagnostics - offered the guy £20 cash in hand and he snapped it up.

Results came back as no signal from front right sensor so problem solved, it also picked up an open circuit on both front sensors; is this normal?

When buying a replacement are the sensors sided, ie will they be different for right and left?

Dan.
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Dal
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Post by Dal »

The left and right sensors on the front are the same.

Glad you've got to the bottom of it.
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Dan 1.7
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Post by Dan 1.7 »

Well, fitted a new sensor I picked up from Eurocar Parts and after a quick spin all seems well.

Pedal feel is also much improved which is a bonus, thanks for your help Dal.

A full service and cam belt change next jobs on the list :grin:
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gordie orange
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Post by gordie orange »

my reading when set to 2000 Ohms are
front passenger 1089
front drivers 1120
would i be right in assuming the 1089 reading is the bust one?
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Dal
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Post by Dal »

Both readings are within tolerance of the 1100 resistance it should be. Have you checked to see if their connected ok? No breaks in the wire? Are the castleations they point at all clear?



Maybe a rear one?
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gordie orange
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Post by gordie orange »

that's the next job, going to take the sensors off and give em a clean,

Think i'm going to owe you a pint soon Dal
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Dal
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Post by Dal »

No worries.

Check the rear ones too as well as the grooves behind the hub sometimes get gunked up with brake shoe dust:

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gordie orange
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Post by gordie orange »

just finished cleaning them, it was the rear ones caked in brake dust, all working again.

Cheers for help Dal,
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Post by Dal »

Good news! Glad it's all sorted now - that's a common one btw so you're not alone! lol

:thumbs:
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doctorevil
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Re: ABS & TC lights

Post by doctorevil »

I bought a new front abs sensor as I took a gamble one of the front sensors had faulted and was the cause of my pumas abs/tc light being on all the time.

I took the puma to my mates workshop hoping he would have a multimeter and that we could check the resistance of the front sensors to check if one was bust. he didnt have his multimeter with him but it was possible to plug the new sensor into each sides relevant socket (although not actually fitting the sensor into its housing as the old ones were left in place - they didnt want to come out easily ) to see if it turned the abs light of on the dash , it didnt. do the sesnors need to be in position to register as working/turn out the abs dash light or was this a good enough test showing that its not a front sensor at fault?
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Re: ABS & TC lights

Post by yippeekiay »

The car won't do a self test until around 15mph when you get the weird graunching sound. Then the lights will go out if the sensors are ok so you need them putting on the car. Much easier to get a multimeter than trial test each one.
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Re: ABS & TC lights

Post by crystalpuma »

Does anyone know if the rear sensors can be tested with a multimeter without removing the brake drums? I only ask as we don't have the required tools for it.
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