Can data link loss 299d3

[FLYWHEEL PRIME]

@emostock send me an email address via DM where I can contact you outside of this forum, there are things you need to check that might have been overlooked

 

[Nige]

I have to laugh at anybody that says stuff like "why would you delete a machine with 5 hours on it!"

Well in that case you're laughing at me as well.......

When the complete aftertreatment system is warranted by the manufacturer for 5 years irrespective of hours and even allows for changes of ownership in that time I have difficulty understanding why anyone would want to mess with the system on a brand-new machine, even in Canada (where the OP is located) where it is not a legal requirement as it is South of the 49th parallel.

 

[FLYWHEEL PRIME]

I think the guys that only work on heavy equipment lose perspective on the average owner/operator that isn't using the equipment 10 hours per day for revenue generating activities. A lot of people purchasing equipment in the size/price range of CTLs are planning on long term ownership. 5 years doesn't mean **** to someone looking for a long term solution.

5 years of allowing exhaust regurgitation and carbon buildup means nothing as soon as that 5 years ends and CAT now has you by the nuts. $12k in DPF removal/cleaning/swaps at 5 years and 6 months might not mean a lot to a full time excavation or paving company, but that is significant coin for private use.

The whole setup is a scam that only benefits tax collectors and OEMs.

 

[Tyler d4c]

Your covered for 5 years worry about it then. You also voided the warranty on the rest of the machine.

 

[FLYWHEEL PRIME]

To be clear, I'm not advocating for this, but I do understand the mentality. The equipment I use for making money is not treated the same way as long term private use.

You also discount experiences people may have had with dealerships. There absolutely are dealerships out there that will do everything possible to get out of warranty work.

 

[emostock]

They replaced my main engine harness today under warranty still same issue I'll have cat come back out and take a look again

 

[Birken Vogt]

Your covered for 5 years worry about it then. You also voided the warranty on the rest of the machine.

Magnusson-Moss does not allow voiding of warranties for something that has nothing to do with the modification. Probably something similar in Canada.

 

[Tyler d4c]

Magnusson-Moss does not allow voiding of warranties for something that has nothing to do with the modification. Probably something similar in Canada.

I hear you but they will argue that you up the power and caused a over load

 

[Chris Carver]

It's a good job you are in Canada or the conversation would have ended right there. It's not forum policy to assist with deleted machines in markets where the aftetreatment system is a legally-mandated requirement.

I don't know what Canada is like but in other markets no dealer would agree to work on a deleted machine for fear of incurring the wrath of the relevant authority.

There are two 60-ohm terminating resistors on the CAN Datalink, so you should have measured 30 ohms not 60. Maybe that's the first place to go looking. Confirm you were measuring across Pins F & G on the service tool connector.?

I'll send you an electrical schematic. Keep an eye on your messages.

View attachment 313924

We are having this same issue, "Can Data Link Lost". Where would we check the resistors mentioned above? I guess where are the resistors located?

 

[Nige]

We are having this same issue, "Can Data Link Lost". Where would we check the resistors mentioned above? I guess where are the resistors located?

You could start with a machine Serial Number.
That gets you an appropriate electrical schematic for that S/N.
The schematic contains the location information.
Please post a photo of the message that comes up on your display screen.

 

[Chris Carver]

You could start with a machine Serial Number.
That gets you an appropriate electrical schematic for that S/N.
The schematic contains the location information.
Please post a photo of the message that comes up on your display screen.

Our machine is actually a 272D
Serial#: BL201241, 2021 mfg date
I don't have an image of the message on the monitor but looks exactly like the images posted by emostock when this forum/chat was started (exactly the same screen/ faults)

 

[Nige]

Not to worry, that's why the S/N is key to everything.
Check your message inbox for an electrical schematic.

When you come to checking the CAN resistors if you measure at one point in the harness you should get a result of 30 ohms. I know there are two resistors and each one is rated at 60 ohms but they are in parallel so the effective resistance as a pair is not 60 ohms, or even 120 ohms as some people seem to think.

 

[greasynails]

I do need to clarify, CAN architecture is based on a pair of 120 ohm resistors in parallel between CAN high and CAN low wires. If you check anywhere on the circuit between high and low you should get 60 ohms.

Rtotal= (R1× R2) / (R1 + R2)

60= (120X120) / (120+120)

60= (14400) / (240)

CAN low is 2.5 volts idle pulled low to 1.5
CAN high is 2.5 volts idle pulled high to 3.5 in a mirror image

This is handy to know because if you get 120 ohms anywhere on the circuit, you likely have an open in the harness that has taken 1 resistor out. If you get lower than 60 you probably have a shorted harness or component. I also fully agree that any major CAN diagnosis really requires a scope as Nige pointed out in the 3rd post on this thread. As far as this latest machine, these kubota powered CTLs and SSLs have had a tremendous amount of engine harness problems. You will very likely end up there.

 

[Nige]

CAN architecture is based on a pair of 120 ohm resistors in parallel between CAN high and CAN low wires. If you check anywhere on the circuit between high and low you should get 60 ohms.

My bad. From memory I thought they were 60 ohm each which would mean that anywhere on the network would measure 30 ohms if both resistors were functioning correctly. That's not the case.

 

[ColdBlackWind]

I do need to clarify, CAN architecture is based on a pair of 120 ohm resistors in parallel between CAN high and CAN low wires. If you check anywhere on the circuit between high and low you should get 60 ohms.

Rtotal= (R1× R2) / (R1 + R2)

60= (120X120) / (120+120)

60= (14400) / (240)

CAN low is 2.5 volts idle pulled low to 1.5
CAN high is 2.5 volts idle pulled high to 3.5 in a mirror image

This is handy to know because if you get 120 ohms anywhere on the circuit, you likely have an open in the harness that has taken 1 resistor out. If you get lower than 60 you probably have a shorted harness or component. I also fully agree that any major CAN diagnosis really requires a scope as Nige pointed out in the 3rd post on this thread. As far as this latest machine, these kubota powered CTLs and SSLs have had a tremendous amount of engine harness problems. You will very likely end up there.

Totally agree with greasynails in issues with harness. Nige has schooled me on tracing individual sensor problems back to PCM on my 2018 299 D2. I am not electrically inclined but have been able to repair a couple of nagging issues with a meter and some patience.