W202 C36 ABS pump/ABS light help please

[binaryduke]

Hi - I am helping my father-in-law improve his P&J 1995 W202 C36. After not being used for a couple of years, a new battery is giving us an always on ABS light preventing an MOT pass.

We have tried the 'steering left/right/left/etc' to reset the light to no avail. Our friendly independent's STAR has pointed us to a fault code on the ABS pump. He and we have now found that:

- we have power to the blue ABS relay
- there is no power to the ABS pump (the red lead feeding the pump at the front right of the engine bay)
- we have replaced the blue ABS relay with a new MB relay
- we have also tested the red ABS pump power supply against a couple of different grounding points ruling out a bad earth

The red lead to the ABS pump is in poor condition. Clearly there is a bad connection between the relay output and the pump's input (I'm testing the power within the lead's connector).

It appears that the red lead to the ABS pump comes from a larger dark green multiple on the front edge of the pump.

Can anyone guide me further in terms of diagnosis/things to test/replace?

Should we be looking at a new pump?
Should we be looking at the loom running from the relay to the pump's multi connector?
Are there any guides on pump removal/replacement?

All help much appreciated.
TIA
BD.

 

[bembo449]

id check that a furry lil critter hasn't helped itself to some of the wiring loom and also check the fuses that protect the system

 

[binaryduke]

Thanks! I don't think it's a fuse issue as annoyingly I can replace/wiggle/contact clean the ABS relay and sometimes the light will extinguish... until I replace the relay box cover/close the bonnet/book an MOT

Any tips on accessing the complete loom/replacing?

 

[bertb1]

Could it be a wheel sensor?


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[binaryduke]

STAR has reported the ABS pump and there's no power on the small connector to the pump.

 

[bertb1]

Ok
I’m only saying as a wheel sensor broken on my car and I had to replace the abs module and have the abs module coded to the car


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[mattkh]

What about the brake light switch above the pedal needing a clean??

 

[bertb1]

Been there done that
A bit of a ball ache
Still sorted in the end


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