Absolutely DEFINATELY 100%, S1 or S2, the colours are:

CTS = Yellow
Thermo Time Switch = Brown
Cold start Injector = Blue
Auxiliary Air Device = Black

Knock Sensor = Green (S2 only)
2nd CTS = White (same shape as the fan sender) (S2 only)

If you're really having problems you may have to resort to tracing wire colours and continuity testing