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Hi
I’ve just bought a 2005 Jimny with the abs light that comes on after 100yds of driving. I have 3 code readers, 1 doesn’t connect and the other 2 say ‘no codes’ so I’ve been round the sensors with a multimeter and got the following readings 1.330, 1.343 at the front and 1.383 and 1.453 at the rear, are these readings close enough to rule out the sensors?
Any other methods of fault finding or recommended scanners/apps that will read the abs ?
Thanks
most simple obd code readers cant read the abs fault codes only the engine ecu.
And the abs sensors give a square wave signal which can only be properly checked with a oscilloscope.
You can check the abs sensor rings for cracks, corrosion and dirt.
Its also possible that the air gap between the abs sensor and the abs sensor ring is to large.
But it might be wise to go to a garage with proper diagnostic equipment to read the fault code first.
so we are not trying to find a needle in a hay stack.
If the problem were caused by a sensor the fault would appear before you drove it.
The fact you have to drive the car a distance before the ABS ECU realises there is a fault I would imagine the fault is more mechanical. I would check the ABS rings for damage, missing teeth, rust, splits, grit, roadkill between the teeth. Front ones are behind the discs, I am pretty sure you can see them with it jacked up (cant check on mine cos it doesnt have ABS!) . The rear ones are a bit trickier because they are behind the brakes on the half shafts. If you can get the sensor out you might be able to see them otherwise you will need to take the half shaft out.
Any time I have had to check anything like this I have had access to a Suzuki dealer computer or Bosch KTS which at least tells you what wheel to focus on. All a fault code reader is going to tell you is what wheel the ABS ECU has a problem with, its not going to tell you if it is the sensor, the ABS ring, the wiring or witchcraft. If you are checking the ABS sensors you want to check for AC millivolts or check the resistance. If you have a signal problem it means the ABS ECU has measured a difference between one sensor and the others. The resistance and signal might still be present in the dodgy one but unless you are measuring them all at the same time you wont notice.
In your position I would assume it to be a signal problem (because you have to drive it 100yds) and I would start by looking at the front sensor rings. If they are ok, next easiest thing to look at is the connectors (but if you have checked the voltage I assume you know their condition)
You could always pop round to your local Suzuki dealer about tea time (10am)or lunchtime with a box of cakes and see if anyone wanted to quickly check the code for you!
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