error codes
hi
pinin 2ltr 04
the abs light flashing on the dash, the blip code of the flashes are 24 rear abs sensor, and 52 lamba sensor. the abs sensor has been changed. when looking at the engine etc with a reader the display says no issues, no code being displayed and the lamba is showing to be working open and closed loop. have you got any ideas many thanks
kkkkbbbb
OK - that means the 52 is ABS related...
An ABS code 52 is listed as a "valve relay problem (stays off), and according to the manual, these codes are output if there is an open-circuit or short-circuit in the ABS-ECU power supply circuit (power supply circuit for solenoid valve & motor) or the internal circuit in the hydraulic unit and ABS-ECU is defective, probable causes are lised as malfunction of wiring haness & connector & malfunction of hydraulic unit and ABS-ECU.
By the way - if this seems like I'm regurgitating the manual - it's because that is exactly what I am doing - I've never needed to work in this area of the
ABS system.
You can download your own copy of the manual from the resource section and follow the troubleshootng steps (fairly simple voltage checks) but I would start by reseating the ABS-ECU connector, clearing the ABS codes, and the waiting to see if they show up again.
Question - have you noticed the brakes, especially rear brakes doing anything unusual - the reason I ask is this - if you do in fact have an ABS fault, the system will either disable the ABS on the affected wheel, or disable itself altogether, leaving you with full braking power, which would/should cause the rear brakes to lock quite easily.
Early ABS systems (like mine) have the old style LSPV fitted, and can safely be driven with the ABS disabled (relatively speaking, they behave like a conventional non-ABS vehicles), later models (I believe yours) may be different.
hithere are no issues with
hi
there are no issues with the rear brakes, forgot to mention, when the vechile is moving the codes disapeer and when the code is flashing, you can here a clicking noise in the abs ecu.also ive just found some thing on a replacement site for the abs pump/ecu, saying when the pump unit is faulty, they can be two code show 52 and 24 rear sensor. any comments
many thanks
Relay under the ABS/ECU
I believe there is a relay mounted under the ABS/ECU that controls the ABS light - the relay is there to turn the light on, unless the ECU says to turn it off, so if the ECU fails, the light stays on, and that's most likely where the clicking is coming from.
As far as the codes go - a 52 is most likely the ABS/ECU, a 24 is a rear wheel sensor, but I see no reason why there should be a particular wheel sensor code associated with an ECU failure, it could just as easily be any one of the other three wheel sensors (21, 22 & 23).
hi Ive taken the bulb out
hi
Ive taken the bulb out of the dash on the abs icon, and the clicking from the ecu abs has stopped. do you think this could be, the relay that is fault mounted under the ecu unit.Also on this age of pinin, when braking heavly should you feel the judder on the brake peddle as on the new modles or not? As this does not feel to have the judder.
many thanks
Uhh - not exactly.
frankly if you are not concerned running without ABS is like not having it there at all - brakes work fine in standard mode
There are at least two different brake systems in use on a ABS equipped iO.
The earlier versions, like the one I have, are fitted with an LSPV over the rear axle and this adjusts the rear braking based on ride height (the ride height is used as a crude method of determining how heavily loaded the vehicle is) - if the vehicle is lightly loaded (riding high), the brake pressures are reduced to reduced the possibility of rear wheel lockup. Later years do no have the LSPV and depend entirely on the ABS to prevent rear wheel lockup.
Running a later vehicle with non functional ABS has an increased risk (compared to the earlier version) of the rear wheels locking on a lightly loaded heavily braked stop, with the possibility of loss of control and swapping of ends.
I fully agree with you Claude.
The brake system should be in 100% working order - I've even been known to install upgraded brake systems so 100+%, but not everyone is in a position to do so, and I will admit that the ABS on my iO is non functional - but - because I have the earlier system, my brakes are as effective as yours (if yours are non-ABS) , and whilst I have considered removing the ABS and leaving it as a "fully functional" non-ABS equipped vehicle, all the components are still in place and I hope to one day, restore it to full functionality.
hi the brakes are fully
hi
the brakes are fully functional , they have been tested on the rolling road, to mot standard, and no issue was found. The noise of the clicking is there but not as noticable with it not flashing on the dash.does any body have any ideas, with the abs ecu if pump or relay?
many thnks
As far as I'm aware...
The particular relay being called out for a code 52 is internal to the ABS unit, so ECU or relay, you're replacing the unit - the other possibility is wiring harness, and you've already been told where to find the troubleshooting information, it's basically a couple of voltage measurements and you'll know one way or the other.
I'll hold my tongue on the "MOT standard" brake test - I don't know how yours are done, but, I'm willing to bet it only tests the ability of the brakes to stop the vehicle within a given distance and completely ignores the effects of a locked tire on stability, which is what ABS is all about.
Syndicate
Let's get the facts...
First point - a flashing ABS light won't get you a lamda sensor code - it is possible to get a 52 from the ABS system - so - did you get the 52 from the ABS light or from the check engine light?
Second - there are two possible codes from each wheel sensor, the first indicates a missing or defective sensor (or sensor related wiring problem), the second, which is what you're getting, says the ABS sysem is not sensing movement on that sensor, at a time when it should (it's seeing movement on the other three) - you may have a working sensor that is incorrectly installed and not sensing the tone ring.