K.W.S TruckTech

14/09/2026

05/09/2026

🔧 One London visit. Four Scania ECUs.

We travelled down to London for two late-model Scanias, a 21 plate and a 22 plate, both just over 300,000 km and both suffering from what is becoming a very familiar ECU failure pattern.

It usually starts with an intermittent hot non-start:

Truck runs normally → switched off hot → refuses to restart → cools down → starts again.

Eventually, the cooling-down trick stops working and the vehicle becomes a permanent non-starter.

Both of these trucks had reached that stage.

The faulty ECUs were removed and replaced with our own refurbished units, programmed to each vehicle, fitted and tested on site.

But that wasn’t quite the end of the ECU collection…

While there, we also collected a third failed ECU for refurbishment. That vehicle had already received a brand-new ECU from Scania earlier this summer.

And a fourth Scania is now storing some of the early fault codes we’ve learned to associate with this failure pattern. It’s still operating, but certainly one to keep an eye on.

✅ 2 refurbished ECUs supplied and fitted
✅ Programmed to the vehicles on site
✅ 1 additional ECU collected for refurbishment
🔎 1 more vehicle showing possible early warning signs
🚛 Both non-running trucks back in service

When several similar-age vehicles in the same fleet begin showing the same progression, recognising the early symptoms becomes rather useful.

KWS TruckTech
HGV diagnostics • ECU programming • ECU refurbishment
Mobile & nationwide ECU services

02/09/2026

🔧 Sometimes you just have to work with what you’ve got!

This Scania stopped at the services and refused to start, leaving the driver going absolutely nowhere.

Diagnostics traced the fault to the ECU. A replacement unit was supplied and fitted on the spot, with our trusty Transit kindly donating some power for the bench setup and programming. 😅

Replacement ECU fitted, programmed and tested.

⏱️ Around an hour later, the Scania was running and back on the road.

No recovery. No workshop visit. No unnecessary downtime.

📍 Mobile HGV diagnostics & ECU programming
🚛 Doncaster & surrounding areas
🔧 KWS TruckTech

25/08/2026

🌙 Late Evening Mercedes Actros Gearbox Breakdown

Customer called with a 2008 Mercedes Actros stuck in 8th gear and refusing to change.

By the time we arrived, things had progressed further and the truck had completely lost gear selection.

With the vehicle stranded at the services, we carried out on-site diagnostics and traced the problem to the clutch stroke sensor circuit.

The culprit? A poor connection at the clutch stroke sensor plug.

Connection repaired, clutch position signal restored and the gearbox immediately returned to normal operation. Truck back selecting gears and back on the road the same evening. ✅

Another reminder that a gearbox fault doesn’t necessarily mean a gearbox failure. Sometimes one bad electrical connection is enough to park an entire HGV.

🔧 Mobile HGV Diagnostics & Electrical Repairs
🌙 Evening & roadside callouts
📍 Doncaster & surrounding areas

KWS TruckTech

07/08/2026

Another day, another vehicle nobody wanted to touch…

Today’s patient was a CNG Iveco suffering from a heavy misfire, warning lights everywhere and generally doing its best impression of a Christmas tree. Which, to be fair, is about the closest most Ivecos get to festive cheer.

After proper diagnostics, the fault was traced to a failed ELDOR ECU. New unit fitted, configured and tested, and the engine was back running as it should.

The customer can now get it exported without worrying whether it’ll make it to the docks.

Sometimes it’s not about replacing half the truck. It’s about finding the actual fault first.

📍 Mobile HGV Diagnostics & Electrical Repairs
📍 Doncaster & surrounding areas

04/08/2026

It’s not every day we get a nice, straightforward job in! 🛠️
While we spend most of our time head-first in wiring diagrams hunting down random, phantom electrical faults, this one was a proper breath of fresh air.
All we needed to do on this cracking Little Park Farm Volvo was convert the signature DRL headlights over to orange. Simple, clean, and looks absolutely spot-on.
Always a pleasure working on a truck that’s kept in top condition like this one! 👌
📍 Mobile dealer-level diagnostics & electrical work
📞 Call/WhatsApp: 07535550409
🌐 Website: www.kwstrucktech.co.uk

We fix trucks. Everyone else guesses.

30/07/2026

Attempting to master the water on family holiday... safe to say I should probably stick to Scania diagnostics and truck spanners! 🌊 Wipeouts aside, having a great time away with the family, though at this rate, I’m not sure if I’ll actually make it back in one piece. See you all soon (hopefully)! 🚛🔧

22/07/2026

DC13 EMS following trends and identifying as a DC16 V8. 😂6️⃣➡️8️⃣

opened up a Scania S8 ECU from an inline-6, traced the board, modified the hardware & software, and converted it to run this S580 V8.

Why wait weeks for main dealers when you can re-engineer modules on the bench? 🛠️⚡

15/07/2026

🧠 Inside a Scania EMS S8 ECU: This isn’t your average diagnostics job!
When a truck develops a complex engine management fault, some places just read the fault codes and tell you to buy an expensive brand-new module. We prefer a deeper look.
This is a Scania EMS S8 Engine Control Unit open on the test bench. If you've ever worked on these, you know they are notoriously difficult to service. The entire circuit board is completely submerged in a thick, protective silicone gel potting compound from the factory.
🔬 The Bench Process:
Chemical Precision: To even begin checking internal components—like the injector transistors or power supply lines—we have to meticulously dissolve and clear away that stubborn protective gel without lifting or damaging the microscopic surface-mount (SMD) components underneath.
Component Testing: Once the board is exposed, we can accurately map out the circuits, check internal traces, and perform component-level diagnostics.
It takes a lot of patience, specialized solvents, and a steady hand, but it’s the difference between a precise component repair and a massive bill for an unnecessary replacement unit. 🛠️⚡
Got a complex, deep-seated electrical fault or an ECU that other shops have written off? Bring it to the specialists.

15/07/2026

🎯 Dynamic ADAS Calibration on a DAF CF Euro 6!
Not all ADAS calibrations require massive, time-consuming static board configurations or targeting frames in the workshop. Today, we took a slightly different route with this DAF CF E6's Advanced Emergency Braking System (AEBS) radar sensor calibration.
Instead of traditional alignment targets, this system relies on a dynamic calibration sequence.
⚡ How it works:
We initiate the procedure directly via our Jaltest diagnostic system.
The truck is then taken on a specific road trip (roughly 20 minutes).
The radar sensor automatically recalculates and maps its reference values live on the road by tracking real-world moving traffic and roadside structures.
By letting the onboard module accurately adapt to actual road environments, the system ensures optimal, precision-calibrated emergency braking functionality when it matters most.
Whether it’s bench-testing ECUs or taking precision diagnostics straight to the road, we’ve got your fleet's safety systems fully covered. 🚚💨
Mechanics