The arrangement on the KU engine looks exactly the same - wire is the same colour.
Having had a quick look in my Haynes and Bentley manuals, I'm none the wiser.
Injection and ignition systems use the MFTS (above it).
Temp gauge sender is on rear of cylinder head.
Thermotime switch for CSV is in radiator.
This single connection doesn't seem to get a mention.
It could be for the ICU (as previously stated, there is no ECU)
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