Need Help Diagnosing Suzuki DF9.9B

[Tedd]

I'm getting a flashing caution light and (sometimes) reduced engine power on my 2018 Suzuki DF9.9B. Perhaps someone can provide some insight.

I connected it to the Suzuki Diagnostic System and the only obvious issue I found was 255 instances of CKP sensor failure and 255 instances of CMP sensor failure. It seems unlikely to me that both would happen simultaneously so I suspect some other thing is causing the system to think there are sensor failures.

There's a diagram in the factory service manual that shows those two sensors having a common ground (see below), which could be a factor. It also shows the lines from both connectors meeting at some component (see the red circle in the diagram) but I don't know what that symbol means. Does that just mean that they go into the same wiring harness? That's the only obvious link between the two sensors that I can see from looking at the engine.

[GreenWave]

Likely posible corrosion in the connections. Can you get to those, disassemble and clean?

[Tedd]

Originally Posted by GreenWave

Likely posible corrosion in the connections. Can you get to those, disassemble and clean?

Thanks, yes, they're pretty accessible and that's a good idea. I'll do that today.

The engine is pretty low time (90 hours). It's a 2018 but it only went in the water for the first time last year, because of Covid. It sat for several years in an unheated garage near Ottawa, so corrosion could easily be a factor.