Anyone familiar with the operating strategy for Vauxhall Multec knock control, Z 16 XE engine?

I have one which logs P0325. When it does this it looses power and will not rev. I caught it doing it once and it had narrowed the inj pulse. Now I am wondering if the code (ie knock control limit) is a symptom or the cause.

The Vauxhall fault description is – Knock sensor circuit fault. The knock sensor voltage is evaluated and produces an implausible value.

The question is, does the ECU pull the inj PW back as part of the knock control strategy?

I still have some work to do on this but knowing this may help me with the direction of my diagnosis.

TIA