Hi all

My Mondeo's developed a few problems It's a 2006 2.2 TDCi estate.

The first of the problems is that the ABS seems to kick in even at low speeds / light braking - then when you drive over a certain speed (about 60mph) both the ABS warning and the handbrake warning lights come on. Once the ABS / handbrake light are on the brake pedal feels normal again but obviously has no ABS or speedo. The car also doesn't seem to start as well as it used to, it's like a weak battery but I've tried a few different known good batteries now - so I cleaned up the main earths, the ones coming off the engine fusebox and added my own earth which has made a bit of a difference but not as much as I'd hoped.

So far I've:

Bled all the brakes (had to change a rear caliper last week)

Removed all the ABS sensors, cleaned them and cleaned the surface rust off where they read from on the front hubs

Disconnected and reconnected the ABS module plug (no moisture / dirt)

Checked all the ABS fuses

Checked the ABS sensor leads / connectors

Measured the resistance of all the ABS sensors - all gave consistent readings

I've ordered a super F cable but I'm hoping there's more I can check before it arrives.



When I turn the engine off / on the warning lights disappear and the pedal gives that ABS type feedback again at low speed and the lights come back on after being driven a bit.

There's also shuddering when the engine is labouring a bit in higher gears - not sure if this is linked.



Anyone got any ideas?

Thanks in advance

Mike

 

Have you got a wheel bearing on the way out? That can trigger an abs fault

 

Sounds like you might also have a dodgey earth.

 

Thanks both - it's had a fairly recent drivers side front wheel bearing but I'll check the passenger side for movement / noise. I've cleaned up all the earths I can find - does the ABS module have it's own separate one?

 

It'll be a sensor. I used f super to read the codes in the abs module in my old mondeo.

 

When my ST TDCI did this, it was a chafed cable somewhere under the rear. cost me about £20 for a garage to locate and repair.