Open the coil/module and check the Color of the Wires !
The yellow/black wire connects to the other terminal on the coil pack that serves cylinders #1 & 4.
The green/black wire connects to the other terminal on the coil pack that serves cylinders # 2 & 5.
The blue/black wire connects to the...
mrtiptop
This helped me and won't do any harm !
I removed the lower Radiator Hose from the Water Pump and there it is the Ground connections !
Three wire eyes with two wires in each !
There is also a wire harness bracket there also !
Using a 15mm socket take everything apart and clean...