ABS fault - HELP!!

[dj_smurph]

clean abs rings and sensors make sure all the rings have the same amount teeth on them


going on my experience as a gas engineer it is very rarely the ecu that goes hell i have even had tech 1 tell me the main ecu has gone on my corsa when the the cat had collapsed

[Doodley]

checked the abs sensors and rings, i done that before i knew about the paperclip test. is that not very reliable test then? all sensor and teeth look in good condition and clean. On the MOT failure sheet, it says "ABS light indicates ABS fault" they dont actually test the ABS do they? so if took the lamp out of the fault light would it pass?

[cornishtaz]

I think you'd have to wire it up so that it came up when the ignition is switched on but goes out when engine is started (usually the oil pressure lamp). But all this will do is mask the problem but would get you you pass certificate.

[cornishtaz]

I've found the paper clip test very useful and I've used it to check various faults. I carried out a test on a 4x4 Cav and it came up with the same fault as the tech 1.

[MickM]

If it says the ABS ECU is faulty then you need to look in that area. If there was a problem with the sensors then it should give a different code. The fact that when you cleaned up the connector the fault disappeared for a while makes me think that your problem lies around there somewhere. Try an ECU from a scrappies just to double check. I'm pretty sure it's a 5 minute job to slave in a new one and test it...!!!

[Doodley]

yeah, it looked tricky,coz some of the terminal connections look sort of soldered,but i checked the manual and they said it just unbolts pulls out and new 1 bolts in!surely it cant be that easy!still....remains to be seen!Phoned vauxhall to find out how much a new one is - £708! I nearly collapsed, jokers! phoned scrappie, they have one for £30! hopefully it will do the trick

[cornishtaz]

I've got one from a 94 Cav 2.0 Ecotec, not sure if they're the same.

[Doodley]

yeah think they are, its the 2EH i kneed, apparently thay are all models 1992 onwards, apparently the local scrappy have one, im going there at the weekend, if they dont i will let you know. cheers!

[Doodley]

Fixed it - YEY! it was the ABS ECU,10 out of 10 for the paperclip test! got one from the scrappy for £30, saving of £678! thanks for all your help

[cornishtaz]

Nice one mate glad you got it sorted.

[RobbieV]

Glad to see that problem sorted [img]/smile.gif[/img] ..........................Next

[1llusion]

How does the CPU look.
Is it under the black box on this pic



I thought it should have this looks, but don't think it fits under there

[tobys73]

the grey box is the ecu usually under a cover in the passenger side sill or in the passenger footwell same as ecu on drivers side

there are 2 versions 1 for 4x4 and one for 2wd with the 2wd one having less teeth on the abs ring than the 4x4 one

one the point of abs rings does anyone know if they are available seperate or if they only come fitted on a new cv?

[Doodley]

as i understood these are completley seperate units. I had a cavalier, this had the unit in the bottom picture on the footwell of the passenger door, but the top picture is the one i have on my calibra. under the black lid is the relays and the ecu(this is 2EH). hope it helps