ABS faults C1256, C1252

[fredjaj]

Hi,

ABS about to die

1. The problem is intermittent, I feel the abs motor running for a long time. upnormal.

It stops for a short time and starts again. It has a short operating cycle. When you press the brake pedal, the abs motor never stops operating.

2. When the brake pedal is pressed for a long time, an alarm light and beep warning activated.

Code C1256 and C1252

So I want to rebuild the ABS unit myself. I have the diagnostic tools and good mechanical experience, as I usually repair my car myself. But before I start, I want advice from you, what most frequently cause this code 1265., and what parts to start with?

 

[felix2566]

Have you checked you dont have any brake fluid leaks or wiring issues first?

I dont know the specifics of your vehicle but is there not a seperate brake booster pump, or is it all built into the ABS unit?

 

[fredjaj]

Have you checked you dont have any brake fluid leaks or wiring issues first?

I dont know the specifics of your vehicle but is there not a seperate brake booster pump, or is it all built into the ABS unit?

Hi, thanks for your reply
Its 2010 Toyota LC200 with one unit ABS Brake Booster, Accumulator, Pump etc see the picture.

No visible leakage.
Wiring issues! Not sure but I'll check it out.

 

[Juddian]

The brake master cyl/abs/booster/accumulator unit pictured looks very similar as those fitted to 120/100/150.
Often if there's an issue its the booster motor itself going faulty, not saying that's the issue here but the error messages in the pic point in that direction.

One or two people on the various forums in the UK have had success sending their booster/accumulator motor to a specialist rewind workshop in London,
these people Electric Motor Repairs, armatures, London, Rewinds, Robson and Francis - [Leaving Land Cruiser Club]

Probably not much use to you because distance but they might offer some advice if you contact them, but hopefully unless you can fit the issue yourself there is somewhere similarly skilled in your country.

As far as i'm aware Toyota don't supply individual parts for the combined brake unit so repair/refurb is the only way forward other than a good used unit, but if anyone knows different i am happy to be corrected.

 

[felix2566]

What kind of diagnostics tool do you have. If possible I would go into the ABS control area and you should be able to activate all the individual components of the system. That will really help isolate what the issue is.
Should be able to pulse the individual solenoids and run the motor.
Plus have a look at the data for all sensors in the system. Are the readings they give out plausible, it might be a sensor that is inhibiting the motor from running properly.