[dwightbresemann]

This is a typical waveform for camshaft/crankshaft.

 

[bangster]

It would be easy to use code on an arduino to provide a sine wave that every 36th is skipped, I have done similar with arduino and simple sine wave using 555 circuit (without the skip, but with ability to change speed, for example).

But really, EPAS isn't enabled without a valid signal from the crankshaft sensor? I would think it is more likely to use some CANBUS messaging, which I suppose is only sent if it senses valid crankshaft data?

 

[Reidermcf]

I'm not sure what the PCM needs to start sending signals over HS-CAN to the EPAS module. Presumably some sort of ignition signal, but I am not sure beyond that.

It would be nice if there was simply an EPAS-enable input on the ECU

 

[Reidermcf]

Any idea where this wire runs? Indicates it goes to the smart junction box but can't find the fuse that it would seem to go with. I am thinking maybe I could at least get it to run in a failsafe mode with just that wire live.

 

[Reidermcf]

Nevermind, it's to pin 35 on the SJB -- I'm dumb. Going to see if that reads a voltage ever.

 

[dwightbresemann]

Here you go.

 

[Reidermcf]

Thanks -- so it looks like fuse 35 is fusing some/all of the pins on connector C2280b, one of which feeds the run/start pin on the power steering control module. Do you happen to have the pinout for C2280b? Or any idea what the run/start pin is looking for? just 12v? 5v?

 

[Reidermcf]

Ok here's what I've measured so far:

Fuse 35 shows 0v with key off, 12v with key on.

Run/start pin, which appears to be shown as pin 9 on C2280b: 0v with key off, 12v with key on.

So that's not the issue. I am surprised it doesn't just run in a failsafe mode with a fixed level of assist when it receives run/start but no CAN messages.

 

[dwightbresemann]

Can communication is for high speed digital data. Such as stability control.

 

[Reidermcf]

So you are suggesting it should work without CAN? I was thinking it would need e.g. speed data via CAN.

But seeing as it's labeled as a diagnostic then maybe not?

It is definitely possible that there is just an issue with the power steering motor itself or something. It's been almost 2 years since the power steering has been running, since the engine has been out for about that long.

 

[dwightbresemann]

You need CAN communication for the power steering to work, is my thinking.

 

[dwightbresemann]

This is what the HS CAN network look like.