CB1100 Idle speed instability problem

[Speed_imp]

I recorded the signals to one same coil. Popgun recorded the signals to both coils. Looking at the videos I realised one thing:

- The valve has 4 wires and 2 coils. All 4 wires are "hot", they send 12 volt pulses
- 2 wires of a same coil send 12 volt pulses of 1/2 cycle long phasing them 1/2 cycle

In the image signals from both sides of same coil


- Both coils are phased between each other 1/4 of a cycle

In the image measuring one wire of coil A and one wire of coil B


- If we number the wires 1 - 2 - 3 - 4 (1 - 2 are coil A and 3 - 4 are coil B let's say) ECU sends the signals is this sequence

1-3-2-4 (complete cycle, 1/4 cycle between them)

In that sequence the valve turns one direction. If the ECU wants to turn it counterwise I suppose it just have to invert 2 wires in a similar way and induction electric motor inverts its rotating direction inverting 2 wires. So it will sequence the signaling this way

1-4-2-3 (complete cycle, 1/4 cycle between each pulse)

This could be checked with 2 probes. One probe connected to both ends of coil A and the other probe connected to both ends of coil B

Just wanted to share this thought with you.