Hi everyone,

I’m hoping someone can point me in the right direction with my Discovery 2 TD5.

The car has the Three Amigos (ABS, TC and HDC lights) and I can’t seem to get rid of them. So far I have:

• Replaced the wheel speed sensors.
• Done a shuttle valve bypass.
• Checked and cleared faults with a Nanocom.

The strange thing is that the ABS light stays on constantly, but the TC and HDC lights will sometimes go out for a second before coming back on.

I’m starting to think it’s an electrical issue rather than a sensor fault. At one point I managed to get communication with the SLABS ECU by adding an earth/ground to the ABS module, and everything seemed to work briefly, but then the problem came back. That makes me wonder if I have a bad ground, wiring issue, power supply problem, or possibly a fault with the SLABS ECU itself.

The Nanocom communicates with the engine ECU fine, but communication with the SLABS system is unreliable and many functions fail to run properly.

Has anyone experienced something similar? If so, what was the cause and what should I check next?

Any help would be greatly appreciated.

 

So you tested a nanocom but could not get it to connect? Maybe a spare slabs unit? It has to have key on to connect of course, will connect with engine running.

 

yeah the Nanocom works fine on my mates disco it says ecu communication error when I go into the SLABS settings in mine though.

 

Along the lines of Extinct's reply, sometimes unplugging and reconnecting the connector at a given computer (in this case, SLABS) can solve issues.

 

...and don't stop with just that connector. The xCUs all communicate across a common bus. In theory, any fault could cause the most marginal player to lose comms with the rest. Disconnecting an reconnecting connectors scrapes corrosion from contacts, essentially cleaning them. Also, what is your off state and running state power bus voltages? Have you checked all of your power and ground connections? Ensuring good power is THE FIRST thing to check when you have unexplicable xCU misbhaviors. It's fine to troubleshoot by following your gut, but AS SOON as what seemed like all of the obvious possible causes come up to be working fine, CHECK POWER!