Hi Andrew. I have just Replaced an Ecu on one of these With A similar fault, ( running on 3 cylinders )
It was logging a Fault for no 3 Cylinder Open Circuit, But On Testing We found out that the Injector and Wiring was OK. But the ecu was not triggering the injector.
I would think that it could shut an Injector down if it sees an ignition misfire, But I have Not Seen any info on this.
Mine was an Instant fix by Replacing the ecu, And I wasn't worried as If It didn't cure the fault, At Least I could have reset the ecu and re-used it.
Only Problem is that they are around £500 + VAT And You Will need a Tech 2 With security Access to fit it, As They come Blank and Need Programming, Then you have to Match the immobiliser and Program the CAN Configuration. ( Not Too Difficult, But it will not start untill All items are correctly programmed. ) H.T.H.