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Discussion Starter #1
Was out for a ride on the weekend about an hour into the the ride my power steering quit. This is the second ride I n a row this has happened. The first time it happened I lost power steering and code p0601 came up but quickly went away but still no power steering. Dealer replaced ecu under warranty saying that was my issue. The power steering was now fixed. Not the case. Took the quad out yesterday and lost power steering again. No codes or lights this time. Fuse is good. Tested relay and it’s good. Long story short is during testing components I find that the CAN circuit has a break. Anybody know what this means and where I should go from here.
 

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CAN stands for Canbus which is the protocol the ATV uses to allow the ECU, the display cluster and the power steering module to communicate with each other. The network consists of 2 wires (yellow and green) and is terminated on either end with a 120 ohm resistor to maintain a specific impedance. If you are experiencing a break in the CAN circuit, check all CAN connection points and trace the green and yellow wires. You will need a wiring diagram to assist in checking the CAN circuit end to end.

Mark
 

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Are you thinking that a resistor has failed or that possibly the power steering module has failed. My dealer can’t fit me in for 2 weeks and I want to figure this out on my own so I can get a ride or 2 in before the bush closes for the season due to fire hazard
 

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What resistance do you get when measured as specified in the attachment in my post above?

Mark
 

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Ok, with 123 ohms, you've got a break in the wiring somewhere or a module issue. Does your gauge cluster work?

I don't have a wiring diagram for your model so I can't give you specific pins to check in module connectors.

I would check continuity on both canbus wires from the ecu to the cluster and ecu to the power steering module first.

I'll try to post diagrams of an 850 canbus network tomorrow.

Mark
 

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Discussion Starter #7
Yes the gauge cluster works. Everything works flawlessly other then the power steering. Occasionally the power steering comes for a few minutes but it then dies again
 

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Here is the diagram of the canbus signals for an 850xp. Yours is probably different. It is odd that there are no codes being set. Check the connector at the power steering unit for issues first.

Mark
 

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So I traced the can circuit through the display connector, the power steering and the ecu. All displaying roughly 1 ohm. What are your thoughts as of the next step if you were me.
 

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I'm wondering if the CAN circuit within the EPS module is toast. That could possible explain the circuit resistance of 120 ohms plus the fact that codes aren't being set. To rule things out, I'd put a 120 ohm resistor across the CAN wires at the EPS connector (removed from the EPS module) and retest the CAN circuit resistance at the diagnostic plug. You should see 60 ohms. If you see 60 ohms then there's something up with the EPS. If not, there's something else going on.

Mark
 
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