Knock Sensor Err34 problem with ECU?

[Skaith4224]

Hi All,

 

R33 Gtst Series 2 1996

 

I've been getting error 34 recently showing an issue with the knock sensors. I've replaced the sensors and checked the looms and all seems fine, however I'm still getting the error

When checking the cables at the ecu I get about 2v from one of the cables but the other cable reads -0.8v and seems to be drawing power.

This is when the sensors are both plugged in and when unplugged.

 

I'm guessing this is an issue with the ECU.

I removed the ECU for inspection and can't see anything obvious so I looked at checking continuity however I'm finding it very difficult to find as the board is multi layer and complex.

I've found what looks like 1 fuse that has continuity from the connector pins but I can't find anything from the second sensor pin. This may be the issue but can't confim.

One thing that confuses me is when checking any of the on board fuses, I don't get continuity, on any of them. Unfortunatley, my knowledge with PCB's is rather limited.

 

Does anyone know about the board and be able to point me in the right direction to diagnose/repair/bypass to get the knock sensors working again?

Please let me know if you need images or any other information.

 

Thanks.