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C4 ABS & PSM - Geniscan reports nothing

ainged
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ainged Member

ainged

Posted
Posted

Hi all,

I'm having a prob with my UK 2001 manual C4 which I hope someone can shed some light on. Whenever I set off as soon as I press the foot brake I get the ABS & PSM lights come on. Turning off the ignition & then restarting clears these, but when I touch the brake again - on they come.

I bought a Geniscan GS1000 to try and read the fault code but it comes back with "No Codes", so from reading on the forum I doubt its the MAF. Engine wise the car seems to be running fine.

what else could it be ? or have I just bought the wrong OBDII reader that can't read what the problem is ?

All help much appreciated

Cheers

Dave

  • Admin
Loren Member

Loren

Posted
  • Admin
Posted

A generic scanner will not read ABS or PSM fault codes they will only read DME (engine) fault codes.

This can sometimes be caused by either a bad MAF sensor or a bad brake light switch -- both should be checked.

ainged Member

ainged

Posted
  • Author
Posted

i've read up on things to check regarding the MAF, but what is involved in checking the brake light switch ?

Cheers

Dave

ainged Member

ainged

Posted
  • Author
Posted

It is the brake light switch :D i've ordered a replacement from Euro Car Parts, so should be here soon.

Thanks for your advice

cheers

D

ainged Member

ainged

Posted
  • Author
Posted

Brake light switch has arrived.

Sorry to have to ask - how do I replace it ?

having a look around the drivers side well and brake lever hasn't helped

Izzy Member

Izzy

Posted
Posted

Use the search function and type "brake light switch", you will get all the info, and pictures

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