Fault code help needed!

Mickey76

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Hi
Newbie here, my e300 has just failed an MOT on the ABS light, ASR & BAS light also on, had codes read (once I found someone who could actually get any codes out of it) c1307 -rr solenoid valve reduce pressure..... Anyone know what this is?? Can't find any info. Anything to do with the BAS module?
Also have been told that my steering wheel and road wheels not being in alignment will anger the cars 'steering angle sensor' - related??

Thanks in advance
Dave
 

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The ABS is the main system that the other things run in, without the ABS being OK the codes are meaningless, it should be a wheel sensor or possibly a reluctance ring on the rear. STAR will tell you what is at fault
 
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Mickey76

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Hi
Thanks for help, I have had reluctor rings done as this fault also came up but has been cleared. Can I rule out BAS then? Wasn't sure where else there would be a solenoid. C1307 is the MB specific code read by the very expensive proper reader, will test the sensors but thought they had their own code...... Is really getting to me this car.
Going to align the s/wheel, lock to lock code clearance won't work and lights only come on once movement commences.

Dave
 

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Is the ABS lamp still on, if so that must be cleared first, the steering lock is for ESP. If a ESP/BAS warning then probably the brake lamp switch, but if the ABS is still on, that is the one the needs to be corrected
 
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Mickey76

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ABS cleared then comes straight back on as soon as you drive, ASR first then BAS then ABS in succession. What is a right rear solenoid valve? Trying to borrow a multimeter to test sensor, any other things I should check?
 

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If the ABS lamp comes on as soon as the car is moved then a sensor or reluctance ring at fault, one this is sorted then the other faults should go away
 
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Mickey76

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Reluctor rings changed and still all ok, RL sensor replaced recently, RR functioning normally (in comparison to new one) testing wiring now back to pump..... Hard to track wiring running behind the ECU....
Still can't find what the fault code actually relates to??? What solenoid??
 
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Could it be solenoid/valve in pump itself, any means of testing this??
 

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The only solenoid valves in any ABS system are in the pump/valve block, so this is almost certainly where the fault lies. Some valve blocks need to be initialised after brake work - don't know if this is so with Mercedes? It may be possible to repair - a new one will be megabucks!

Neil
 

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I think the pump block is just fine as its reading all sensors when the key is turned, the ABS lamp comes on as soon as the car is moving, this shows it is not picking up the correct reading from a wheel sensor.

The ABS pumps have a built in reference oscillator, it ís used as a comparator for the incoming counts from the wheel sensors
 
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Mickey76

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Been checking relays etc with no luck, sorry to be a pain television but are you saying its a wiring fault? What ohms/ volts should I be getting from sensor? Ohms 1645 RL and 1730 RR - another website said this was perfectly acceptable. Volts vary but appear the same when I spin wheels.
I will try testing/replacing sensor first (cheapest) then abs pump/ecu?
Abs ECU control unit worth renewing?
Other than doing these listed I'm stumped...... Really need car to pass MOT ASAP.....

Thanks again for help
 

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Nope,,, nothing wrong with the wiring or the actual sensors, one is not picking up a correct signal from a front bearing or the rear reluctance ring.

If it was a wiring or actual sensor O/C then the lamp would be on as soon as you started the car
 
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It doesn't kick in until abs does-- about 3mph?-- if I creep along our road without moving needle on speedo, no abs light comes on, but once on doesn't go off til restart.
Front bearing? Have a sensor? Not have a seperate code? Could you explain bearing please, sorry I'm only 24 and am used to mercs a lot older (and simpler)... What am I actually looking for, if no wiring at damaged then why no signal? ABS Ecu ko3? Tried disconnecting this and dash just said 'display fault' temporarily but no difference to abs light.

Just out of curiosity why is merc dealership unable to tell me what this code is.... Lots of head scratching...
 

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These things are magnetic and work with hall sensors, the tip must be clean. if the magnetic ring is damaged then incorrect readings.

I believe that the magnetic driver is the Radial seal ring (I could be wrong here)

I have an idea, jack up each wheel in turn, turn on, then spin the wheel and see what happens to the ABS lamp, there should be an odd man out here.

I know a mad idea, but it could work, any one that puts the lamp on is working

Come on techies help please
 
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Mickey76

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Brilliant, never thought of that, will go try now

Thanks
 
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Mickey76

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Right rear wheel sets it off.
They are slotted reluctor rings, 48 slot with magnetic sensors. Will take sensor off and clean it, but seemed to work fine through multimeter when wheel was spun- behaved the same as RL sensor.....
 

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The one that sets it off is OK as the other wheels are not moving,you need the wheels that does nothing
 
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Mickey76

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I don't understand. Surely the light comes on when a fault is reported via electronics, when the wheel is spun the sensor picks up the fault ABS ecu will shut off abs, illuminate dash light and store the code. Can't be a prob on all other 3 wheels?? Left hand rear fault read something like --LR reluctor incorrect number of teeth, so not long had sensor and ring done. If it was sensor or reluctor related it would surely show in fault code?
The code and actual fault don't seem to match to me, actual fault as you say suggests communication difficulty at wheel. But code suggests more towards a pump issue or wiring from pump?
Rang/ had it to merc specialist, dealership, local garage etc and no-one will pass comment on this code. They just say only thing witha solenoid is pump TRY changing that first. Is fault code wrong?
 

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When you spin one wheel, the other three are not moving, so the wheel that is able to put the ABS warning on is working OK. As the rear turns it on I was hoping that one of the fronts will not put it on, that being the faulty one.

When the lamp comes on by turning one wheel , that is a fault as again the others are not turning.

Maybe my idea is not right, but I cannot see why not

The fact that when you turn on and the lamp is off does show that there is nothing open circuit. you should also be able to detect a voltage by spinning a wheel and measuring the sensors.
 
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Mickey76

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Got voltages from back two wheels near enough identicle, only rear right hand wheel sets the lights on. Code fault being right rear. When running the car with left rear wheel up off ground when you blip accel traction control kicks in properly. There is a brake pad wear indicator cable but not connected to pads, my last merc was like this n caused no probs but just checking, getting desperate!!
Stating 'reduced pressure' in code wouldn't mean I needed to bleed the pump or something? Calliper fault?
 

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