Hi all, currently have a 2006 BT RRB1 that has developed a very strange drive fault, and I am running out of ideas. I will try and explain.

Although it does it in both directions, for this example;

If you are driving forward very slowly (with minimal pressure on the accelerator pedal) and flick the direction lever to change direction, the truck will continue to drive forward, even though the indicators on the dash are showing that you have chosen reverse. If you press down harder on the accelerator pedal, it will speed up in the wrong direction and then after a second or so, cut to the correct direction you have selected. It will not do it if you are a heavy-footed operator.

The truck has had a new main controller (PN:229764-004) and all the parameters have been set with the CANKey, this made no difference.

I have also swapped the drive motor, both motor inverters, the direction switch, the emergency cut off switch and the pedal box assembly (accelerator, brake, deadman) from a donor truck I have here and still no change. Fitting the bits from the effected truck onto the donor truck also doesn't effect the donor truck with the problem.

I have also bridged out the seat switch, the lift height indicator sensor system and the steer angle indicator system and still no change.

I have absolutely no fault codes, and I am running out of ideas.

Has anyone had any experience with a similar issue they can shed some advice on?

Kind regards,

Dan