The Weekly Waffle

Let's talk back pressure valves  Following on from my diagnostic and replacement here. We can waffle this week about the BPV or Back Pressure Valve fitted to DAF Mx-11 and mx-13 engines.  Once apon a time we use to have the exhaust brake and it's only job was to create some back pressure on over run.  How things have changed! With the introduction of euro 6 came smart actuators such as the VTG (you can find a bit about that here ) the EGR and the BPV. Now tasked with a multitude of different operations the BPV must now assist the PCI ECU in different operations such as: warming the engine up from cold achieved by creating a lower opening percentage of the butterfly valve. Assist and work in unison in creating backpressure for the EGR valve  Decreasing exhaust gas flow in the EAS system in order to heat up scr and the dpf element Adapt pressure situations in the turbo for better turbine rotor control.  create back pressure for engine braking.  Why is it s

FRAME CAN FUN Sorry bit of a long one in this week's waffle, as it will be about the advancements from euro 6 to model year 17 which I touched on at the end of my video anyway let's talk about the components involved in making this happen. Frame CAN or F-CAN to the uninitiated, is yet another system to go wrong in some people’s eyes, yet the ability to operate inputs and outputs at the rear of the vehicle with only two wires is AMAZING! VEHICLE ELECTRONIC CONTROL UNIT We will start at the front of the truck in the cab where VECU is located. The centre of all vehicle data communication and the location of key control operations is the VECU (Vehicle Electronic Control Unit).  The vehicle cannot be driven if the VECU is not operational. DAF introduced VECU to vehicles from specification week 2 2017-25. VECU replaced VIC-3 (vehicle intelligence centre) and the CSM (cabin switch module) which I won't talk about today as we don't have all day!  The VE