Thread: funny goings on with self check

My first thought was maybe the wire at the BCU has been cut if it's a early D2 with a diff lock kit fitted.
Have a look at step 20 on... www.discovery2.co.uk/Factory Diff Lock.

I have no idea if this has the effect your talking of but maybe it's a starting point.

mmm an interesting point, thanks for starting me in a direction, now are you saying that maybe mine has been cut and needs to be reconnected, I have the cdl internals and have connected it to a lever for engagement, when I have the cdl engaged the hdc light comes on ok when I activate it, is it possible to remap the outputs from the slabs via a nanocom or such and save back to the map file, if it is cut and I reconnect does that mean the 3 will be disabled when i put the cdl in

cheers

ken

Originally Posted by frostyblue

mmm an interesting point, thanks for starting me in a direction, now are you saying that maybe mine has been cut and needs to be reconnected, I have the cdl internals and have connected it to a lever for engagement, when I have the cdl engaged the hdc light comes on ok when I activate it, is it possible to remap the outputs from the slabs via a nanocom or such and save back to the map file, if it is cut and I reconnect does that mean the 3 will be disabled when i put the cdl in

cheers

ken

G'day Ken,
I also have the internals and fitted a activation cable('99 model).
I have not cut the wire so if I have it connected and shut the motor down on restart I get 2 of the 3 lads visit.
Disconnecting the CDL a restart sees them go(can't recall which 2 though).
The HDC only works in low range, in high range it should produce a chime IIRC.
From what I've read there is debate as to if cutting the wire disables the TC/HDC or not.
I'm not aware of a software fix and not sure if the latter SLAB's can be fitted.

It shouldn't be to hard to drop the glove box out and have a look to see if the wire has been disconnected if that's where others point also.
If you have a nanacom you could try unplugging a wheel sensor and see if the lads do visit, then reconnect and clear the fault.
We don't see many complaints of people not getting the 3 lads, most folk are usually trying to get them to move on.
Sorry I can't be of more help but now we have bumped the thread someone else may be able to.

Cheers, Kyle.

Thanks, mine does chime in high range if you try to engage lr, I wonder why they dont light up in the nanocom test, when I plug the nanocom in and go to slabs the hdc and handbrake lights come on, is it poss to manipulate thru a nanocom eg giving them a diff value in the map, hope some guru will chip in and helpout, I will look at the wires first chance I get

cheers

ken

Is it possible that the slabs is faulty, if you wanted to hide the 3 amigos how would you do it

cheers

ken

Originally Posted by alien

Disconnecting the CDL a restart sees them go(can't recall which 2 though).
The HDC only works in low range, in high range it should produce a chime IIRC.
From what I've read there is debate as to if cutting the wire disables the TC/HDC or not.
I'm not aware of a software fix and not sure if the latter SLAB's can be fitted.

Shouldn't be any debate by now.

The wire cut stops the SLABS sensing the CDL is locked, ETC and HDC behave as if the centre diff is unlocked.

There are no software fixes. The SLABS ECU uses 3 micro controllers with internal one time programmable EPROM's. To change the programming would require purchasing and reprogramming at least two micro controllers.

The SLABS ECU swap is straight forward providing you have access to a diagnostic tool. The SRD500070 part which was fitted to MY2004 D2's supersedes all previous versions for the entire range (1999-2004) and is actually a recommended fix on earlier vehicles for some problems that cannot be traced to faulty sensors.

If the lights aren't coming on it's possible the LED's have been taped over but if the HDC light comes on when you test with the Nanocom that seems unlikely.

Double check in the BCU instrument panel settings that TRC and HDC are set to on.

The other thing to check in the SLABS module that the low range switch is changing from open to closed (or vice versa) when you shift range.

cheers
Paul

If the wires are disconnected at the abs pump should the abs light come on, if so my doesnt, at my wits end with this, I dont want the 3 amigos but they should come thru various faults that ive had, I wish I could try another slabs but $200 plus makes it hard, im just about ready to sell the damn thing

I have a 1999 D2, CDL internals, purchased a CDL kit, fitted it. This kit has a separate lever to actuate the CDL, next to the H/L lever. Using this mod. I have found;
If CDL is engaged before starting engine, TC & ABS will not be functional. The TC & ABS lights will illuminate in the dash, and to regain function of the CDL & TC , I must turn the engine off, & disengage CDL. Disengaging CDL whilst engine is running, TC & ABS lights will remain on.


Turning the engine on, & engaging CDL, TC & ABS are functional, no lights on the dash. In soft sand, I have had TC function in this mode. I don't really understand fully the reasons for this, but that is how it works for me.

HDC, from the drivers manual;
HDC 'green', illuminates briefly as a bulb & system check when the starter switch is turned to position 'II' & also when HDC is selected. If HDC is selected when low range gears are engaged the light will illuminate continuously indicating that HDC is active. When HDC is selected & non-operating gears are engaged[ ie high range] the light will flash to to inform the driver that HDC is selected, but not operate. If the light starts to flash while HDC is active, normal functionality may cease & HDC 'fade out' may occur.


HDC failure [ amber] The light illuminates briefly as a bulb & system check when the starter switch is turned to position 'II'. If the light illuminates any other time, either a fault has occurred which affects the functionality, or over use of the system has been detected in which case HDC may ' fade out'. [ Accompanied by a warning chime sounding 3 times]


HDC; from RAVE


New Discovery Technical Briefing


The HDC system is functional in low range gears only. The driver activates the system by


selecting low range on the transfer gearbox and depressing the hill descent control switch


(see figure 110). It is important that the foot brake is not depressed as HDC will be over-


ridden. HDC operates in all gears when in low range and can also function in neutral. However,


when it detects neutral has been selected, it will give a warning to the driver and be functional


for only a limited period of time. There is no direct signal from the manual gearbox or the


automatic gearbox to indicate to the SLABS ECU which gear has been selected. The ECU


calculates this by using signals from the engine management system, engine speed signal


and its own calculated road speed. If the ECU detects no gear is selected, or that the clutch is


depressed, then a fixed target speed is selected. This target speed will be detailed later in this


section. The system will operate for 60 seconds with neutral selected before ‚fade-out™ begins.


Fade-out refers to the system continuing to operate, but increasing the target speed


automatically at a predetermined rate. When the fade-out speed increases to above 50 km/h


(31.25 mph), or if the throttle angle raises the target speed to above its current threshold,


fade-out will be cancelled 0


The drivers handbook states;
Hill descent control