Thread: Swapped out SLABS box and now a problem

Hi - semi new here and needing some advice. Here's the details.

2000 Disco 2 w/ SLS, Auto Trans, US model. No 3 amigos, no error codes until I added CDL to the truck and was getting the error when CDL is engaged and you turn on/off the truck,. Not the end of the world but in my relentless pursuit of perfection... I read everywhere that it is possible to swap in a 2003 or 2004 SLABS unit to avoid this and no cutting wires. And the newer D2a SLABS boxes from 03/04 are supposed to take CDL into account and thus, better traction control.

I have now tried 3 separate 03/04 SLABS boxes and all of them give me the same error code - "PWM signal failure from Engine ECU" and the TC and HDC lamps illuminate.

If I swap back in the original 00 SLABS, there are no error codes (unless I start the car with the CDL engaged and then I get the 3 amigos).

I originally thought the "new" 03 SLABS was bad, but I tried another, and then one from an 04, and all have the exact same error when I drag out the Nanocom.

Someone else must have run into this, it seems like something in the 03/04 SLABS box isn't playing nice (all SLABS boxes have been changed to air suspension, and heights set up).

I've identified relevant connectors, wiring, these 3:

Engine ECU 0637-17 - PWM output to SLABS CO504-10 (White-Silver)
Engine ECU 0637-34 - PWM input- Rough Road Signal to SLABS C0504-4 (Red-Green wire)
Engine ECU 0636-29 - PWM HDC Output (Silver-Purple) to C)504 - 10 on SLABS
IMG_1756.jpgIMG_1770.jpg

Ideas?

Hi

A short term solution maybe to do the wire cut as per this www.discovery2.co.uk/Factory Diff Lock and leave the original SLABS in?

Not sure about the PWM fault sorry

Lemo