Mine was similar, I've since fixed it though. I managed to catch mine at the ECU plug, so was just able to wire in a new 60 pin ECU connector (which I got for £5 from scrapyard). The tell was when my turbo actuator sensor signal wire started triggering a low voltage code, and I noticed this signal wire was right next to coolant pump B signal wire in the 60 pin ECU connector plug. I think in the end I had to replace 3 pins in the connector plug as they had completely burnt off, was fiddly re-pinning the 60 wires into a new connector but satisfying once complete. Oh, I also had to replace the pins and connector at the pump end too, that was hard as there isnt much length on that piece of loom, I managed to get at it by moving the alternator back to free up a gap! Has been fine ever since.