Oh dear darn abs
#1
Glennvestite
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Oh dear darn abs
Im having problems with the abs light which keeps coming on the dash.
I took my car to central day on way there and back the light stayed off.
Drove to work the next day bloody light came on.I cleaned both rear sensors and pick up ring and osf the other week.The light come back on.I removed the nsf drive shaft and the pick up ring was covered.in grease and shit.Cleaned that and replaced the sensor.
The light stayed off for 1 day then come back on lol.
I start the car up both lights go out.When im braking the pedal is pumping on my foot slightly then the light will come on.Also i could be wrong but where i live there are a few speed bumps,when i go over these the light sometimes comes off. If i slow down the light will go out.Also when i go round corners this will bring the light on too.
Could a abs sensor be faulty.I thought if they were faulty the light would stay on from start up????
Is there something i can make that i can plug into the abs diagnostic plug to see if i can get flash codes out of it.
Any help would be great...And no im not taking the bulb out..
I took my car to central day on way there and back the light stayed off.
Drove to work the next day bloody light came on.I cleaned both rear sensors and pick up ring and osf the other week.The light come back on.I removed the nsf drive shaft and the pick up ring was covered.in grease and shit.Cleaned that and replaced the sensor.
The light stayed off for 1 day then come back on lol.
I start the car up both lights go out.When im braking the pedal is pumping on my foot slightly then the light will come on.Also i could be wrong but where i live there are a few speed bumps,when i go over these the light sometimes comes off. If i slow down the light will go out.Also when i go round corners this will bring the light on too.
Could a abs sensor be faulty.I thought if they were faulty the light would stay on from start up????
Is there something i can make that i can plug into the abs diagnostic plug to see if i can get flash codes out of it.
Any help would be great...And no im not taking the bulb out..
Last edited by Turbosystems; 07-05-2012 at 03:49 PM.
#3
Glennvestite
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Its just pissing me off now.Ive had nowt but chew with the abs over the last few years.I repaced the rear sensors a few years ago cause they had corroded and ive changed the nsf sensor cleaned the.shit of the ring (ow eeerrrrr) and its still playing up.
Ive got some technical if on the system so im gonna check for resistence on the sensors later on.Ive got a few spare sensors incase its on of them.
Ive got some technical if on the system so im gonna check for resistence on the sensors later on.Ive got a few spare sensors incase its on of them.
#4
PassionFord Post Troll
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If one of the sensors was out of spec the light would stay on from is initial test period when you turn the ignition on. It will be a sensor not picking up properly I'm sure you can measure the ac voltage across the sensor when you spin the wheel. I can't remember of the top of my head what sort of result you should get though.
Do a search for posts containing abs by a bloke called jon@work I'm sure he had posted up some good technical info.
Do a search for posts containing abs by a bloke called jon@work I'm sure he had posted up some good technical info.
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#9
Part of the Furniture
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I had the same thing. Sometimes it woked, sometimes it didnt. When it stopped working the car would not brake at all with a solid pedal or would just lock up with the faintest touch. Scarey!
That turned out to be a sensor in the end. just had to buy one and swap them round until it was cured. That took a while because it was so intermitent.
That turned out to be a sensor in the end. just had to buy one and swap them round until it was cured. That took a while because it was so intermitent.
#10
Glennvestite
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If one of the sensors was out of spec the light would stay on from is initial test period when you turn the ignition on. It will be a sensor not picking up properly I'm sure you can measure the ac voltage across the sensor when you spin the wheel. I can't remember of the top of my head what sort of result you should get though.
Do a search for posts containing abs by a bloke called jon@work I'm sure he had posted up some good technical info.
Do a search for posts containing abs by a bloke called jon@work I'm sure he had posted up some good technical info.
#12
Glennvestite
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Thats what i thought matey. I will check the resistance soon.It would be ideal just to plug something into the diagnstic plug on the abs ecu to see which side it is.
#14
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despite what you read the sierras don't have any
measure the wheel speed out puts at the ecu at 15mph
meter set to ac
what you should get is a similar out put for all 4 sensors at this speed
If the sensors are original fit new ones
they are antiques
you can eliminate the faulty level sensors by simply bridging the connectors on the white loom plug
#15
Glennvestite
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I always thought they had one for the ecu. The sensors i have replaced have been secondhand but they look like good sensors.I will have to check the resistance then go from there.
I will have to get all 4 wheels off the floor to check they ar picking up the signal from the pick up rings.
I will have to get all 4 wheels off the floor to check they ar picking up the signal from the pick up rings.
#18
Glennvestite
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So im gonna need to jack the car up so all 4 wheels are off the floor then try and spin the wheels or start the car up and put in gear cause with it been 4x4 the wheels are a bit hard to turn.
#22
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only the escort cosworth supports diagnostics
despite what you read the sierras don't have any
measure the wheel speed out puts at the ecu at 15mph
meter set to ac
what you should get is a similar out put for all 4 sensors at this speed
If the sensors are original fit new ones
they are antiques
you can eliminate the faulty level sensors by simply bridging the connectors on the white loom plug
despite what you read the sierras don't have any
measure the wheel speed out puts at the ecu at 15mph
meter set to ac
what you should get is a similar out put for all 4 sensors at this speed
If the sensors are original fit new ones
they are antiques
you can eliminate the faulty level sensors by simply bridging the connectors on the white loom plug
#23
Hi m8 when i had my 3 door i had the same problem ,mine started after i bled me brakes and i dropped my brake fluid cap done on the cross member.After that my abs light would come on for no reason ,so i changed the cap and that sorted it for me might be worth ago for the sake of a tenner
#26
All i can rember is i never had a problem before i dropped the cap so i new it could only be that so i never got involved with it as it was a easy fix for me .Well worth a try thou
#27
PassionFord Post Whore!!
Glenn - I don't know..not exactly, but it should increase voltage with speed.
If you're driving along at 15 mph in a straight line, the output voltages from each sensor should be roughly the same (As Uncle Tony has posted above)
Need to figure out which pins on your ABS ECU connector are from the sensors. Instead of jamming the multimeter probes in the connector, which can spread them out and cause poor connection,, use a paper clip or similar. (Sorry if this is teaching you to suck eggs)
It's a lot easier on modern cars where you can just view live data via the OBD socket
If you're driving along at 15 mph in a straight line, the output voltages from each sensor should be roughly the same (As Uncle Tony has posted above)
Need to figure out which pins on your ABS ECU connector are from the sensors. Instead of jamming the multimeter probes in the connector, which can spread them out and cause poor connection,, use a paper clip or similar. (Sorry if this is teaching you to suck eggs)
It's a lot easier on modern cars where you can just view live data via the OBD socket
Last edited by GVK.; 09-05-2012 at 06:55 PM.
#28
Glennvestite
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Ive had the abs ecu plug off before when i was checking resistance of the wires. I just used to plugging a computer into the car/van then spinning the wheels to see if the sensors are ok.
#38
Glennvestite
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Right i had a bit of a play with the abs. I must be doing something wrong or my multi meter is shit.
I could read the resistance from the pins on the abs loom but couldnt get the voltage.Ive got this bit of info ive been using.
This is my multi meter.Where does it need to be set at then cause i selected all of them and i all i can get to work is the resistance.
I could read the resistance from the pins on the abs loom but couldnt get the voltage.Ive got this bit of info ive been using.
This is my multi meter.Where does it need to be set at then cause i selected all of them and i all i can get to work is the resistance.