Hello all,

I'm currently going through the wiring diagrams of both the MSA15 86pin and EDC15 121pin ECU pinouts for VW T4.

I have seen that people have made these looms up to utilise the EDC15 on other VAG cars successfully.

Although on the VW T4 schematics I have noticed that some sensors and switches are wired different.

For example, the MSA15 uses a single ground for the sensors, and the brake and clutch switch pull to earth. Whereas on the EDC15 some sensors have their own lines to the ECU instead of shared ground, and the brake/clutch switch's are wired to 12v not earth.

Can anybody help? Pointers?

I don't want to have to make too many changes to the rest of the vehicle loom, as that defeats the point in making this sub loom to utilise the EDC15 ECU in the first place!

Many thanks, Paul!