Abs Lights.

[gjh]

Hi guys,hope some can help,first time posting allthough iv'e been keeping up to date with the forum over the last two years,my problem is when i start the car up all lights go of as they should,and as soon as i brake the ABS,check brake system,starts flashing and stays on.So every time i stop the rav the same thing happen's.Iv'e looked through alot of posting's,but carn't seem to find any on ABS system's.thankyou for any help you can give.gjh.

[Madasafish]

I have debugged other Toyota ABS systems... and frankly this does not appear simple. It appears the ABS system finds a fault when braking only.. which could be anything from a failed sensor, failed yaw sensor corrosion etc...The easiest way to find out is to read the ABS fault codes.. Which usually means a fault code reader which covers ABS as well as engine - (Normal cheap engine fault code readers are not relevant). So a Toyota dealer or buy a reader.See http://tinyurl.com/pxdeljx

The layout is like this for the ABS circuits..http://tinyurl.com/omgfg5q

Likely faults: corroded reluctor rings, cracked ditto,wiring faults, wheel bearing faulty giving unequal readings when braking, etc.

I would check all wheel bearing first.. And then inspect the reluctor rings.. where possible.

After that, a fault code reading which probably means a Toyota garage or an independent with Toyota diagnostics.. It could be a corroded wire under stress which moves under breaking and interrupts the circuit...You need a multimeter to test the circuit runs

But I stress I am no expert (my faults were sensors - broken wiring)

[gjnorthall]

Usually a hardware problem such as a damaged sensor will permanently illuminate the lamp. It's probably not worth buying an ABS code reader - but most garages will be able to read retained codes for a small charge.

[gjh]

thank's guy's iv'e booked it into my local garage so i think they will be able to sort it, without going to Mr T's.gjh

[gjh]

Hi all i'm back again after having the codes read,which read.C1223 Fault in ABS control system,and C1267 Pedal force/loadsensor switch fault.allso my local garage carn't fix it,so can any of you lads help me out at all with the codes and what they mean,thanks. gjh.

[Devon Aygo]

C1267 Is the main code C1223 is set when a fault is detected in the ABS so it will always come on with another code.

C1267 Is related to a fault within the load/pressure sensor in the brake pedal assembly ( DO NOT remove the switch from the pedal as it is under a pre set tension, removing it will result in a dead switch, if a new switch is required a new complete pedal assembly is required.)

The diagnosis requires resistance checks across the switch if these are out then fit a new pedal assembly, if OK then :

Check resistances across wiring harness between the switch a ABS/VSC control unit if out then repair/replace harness, if OK then:

Replace ABS/VSC Actuator assembly.

This diagnosis will need either a Toyota dealer or an auto electrician with access to to Toyota's diagnostic instructions.

[gjh]

Hi devon,thanks for the quick responce,iv'e taken on board what you have said.iv'e booked it into Mr T's tomorrow.I did ring an indipendent sparky and they diden't want to touch it,so i had no alternative,hopefully it won't be too expensive,i will post there findings.Thankyou for your help.gjh.

[gjh]

Hi devon,it was exactly as you said.the pressure switch in the brake pedal assembly,they are going to fit a complete unit.Not cheap by any means,£530.65,all in, they say it's a four hour job,why would any one design abrake pedal that dos'ent have a switch that can't be changed.So guys you all know what it costs for a plastic switch and brake pedal,thanks to you lads for answering my posts and have a nice evening.gjh.