2018 Vw touran customer complaint lots of warning lights on the dash in the morning then after 15min the warning lights would go away and the vehicle was good for the day. It had been to 2 other shops and the VW main dealer with no success so in my view quite a tricky problem to trace being so intermittent .
Now when he brought the vehicle over for some brake pads and new glow plugs I scanned the vehicle for some history codes and pretty much all I saw was a bunch of no communication codes and no communication with ECM PCM ECU , but at this point everything was working fine no warnings on the dash .
Finish the jobs drove the vehicle outside then when the customer friend came to pick up the car it didn't start and I saw for the first all the warnings on the dash, scanned the vehicle for code again and noticed no communication with the ecu .
You guys probably noticed I like to generally test system straight at the component but in this case the ecu module had one those cages and some security bolts , that's when I decided to check out @Diagnosedan TSB where it proved very useful in this case, I found a TSB for a common faulty VW 645 relay which I believe is basically terminal 30 relay for some circuits.
VW Relay part number 4H0951253A
Diagnose Dan TSB [ Ссылка ]
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