U1002

[D1dad]

Bought a new scanner to release the EPB on my wife’s Altima 22 SL. While playing with it I went around and scanned all my cars, and this code popped up on my 18 rogue under abs. No lights on the dash so I’m confused why this would be here? I do switch from summer to winter tires and just switched back. The time for the tpms to register takes awhile and can’t believe that it would bury a code somewhere. Any clues what this would be? I’m taking this thing to east coast and don’t need any problems.

[VStar650CL]

U1002 is exactly like U1000 but applies to units the ABS expects to hear from on a heartbeat of 2 seconds or less. U1000 applies to units the ABS expects to hear from on a heartbeat longer than 2 seconds or only hear PRN. There are only 4 units on an '18 that report to the ABS on a fast timebase, the ECM, TCM, SAS, and Lane Camera. The former three would have all caused a Christmas tree. The Lane Cam wouldn't if it was simply blocked or overheating, you'd only get a temporarily blinky crash lamp with no codes present. So the cam would be my best guess. If it will erase (either immediately or after a key cycle) then it may mean a cam that's running hot, but it may just be from a temporary blockage that didn't mean anything.

[D1dad]

I cleared the code and ran a couple of errands and it came back. If I wouldn’t have scanned it, I never would have known. Is this something I need to take to get addressed that can cause issues Vstar? The only issue I’ve had with the car was a couple of weird starts after I replaced the coil packs and plugs and failed to fully snap a harness completely. It caused a misfire (obviously) and I found it right away. I chalked up the long start to the computer adjusting. Then yesterday it started and missed for a second. I’m also running cheaper denso plugs than stock but are still a plug that the vehicle calls for.

[D1dad]

And the code says “past” but keeps coming back. Maybe my scanner can’t clear it?

[VStar650CL]

No, I'd be pretty sure it's clearing. That means it's recurring very quickly (too fast to turn on a lamp) and then going past again. Yowch, that's gonna be hellish to diagnose because any of the four systems could be causing it. Given the circumstances, I think maybe a bad SAS is the likely culprit. That isn't the behavior of a blocked cam.

[D1dad]

Any recommendations? Is this a major issue? Honestly there isn’t a hiccup of an issue. Steering is perfect, I just put new rotors and pads on yesterday and not a single light on the dash. I’m honestly amazed that this code is there considering how things are with the car.

[D1dad]

And would this have anything to do with a couple of rough starts?

[VStar650CL]

Any recommendations? Is this a major issue? Honestly there isn’t a hiccup of an issue. Steering is perfect, I just put new rotors and pads on yesterday and not a single light on the dash. I’m honestly amazed that this code is there considering how things are with the car.

It's not an issue as long as it just continues to hiccup and then go past. If it becomes longer than 2 second hiccups you'll get ABS/slip and maybe collision lights and the VDC will go offline.

[VStar650CL]

And would this have anything to do with a couple of rough starts?

I'd say, "remotely possible but very unlikely." Try driving it with the scanner connected and see what the circumstances are when it pops up. If it just appears out of noplace then the SAS or cam are the most likely suspects (in that order). If there's any sort of transient noise from the rear that corresponds, then it's definitely the SAS (ABS actuator popping for a few milliseconds). If there's any hint of an engine or transmission hiccup which corresponds, that's different. I just think that's unlikely, you'd have other codes.

[D1dad]

Cam as in camshaft? Also what kind of noise from the rear am I looking for? I have noticed a little thumping sound when my foot’s on the brake when setting at a redlight that goes away as soon as I let off the brake. I had my mechanic look at it and he didn’t hear it. Of course, I’m way more tuned in than someone who doesn’t drive the car everyday. There’s no engine noise or transmission hiccups in any way. I did scan my 21 and 24 and there was all kinds of codes for airbags and abs on both of those as well. But I cleared them and they didn’t return.

[VStar650CL]

If it's the SAS then you're listening for a tiny click or thunk coming from one rear wheel while turning. It's because the SAS shows a sudden steering angle change which makes the ABS think the vehicle might yaw, so it bumps a rear actuator for a few milliseconds. That's often accompanied by the SAS transiently dropping out on CAN, so you get a U1002 with no other codes because the ABS doesn't consider the faux yaw to be a fault.

[D1dad]

No noises what so ever. I recalibrated the sas and it went as planned, cleared the abs code and it came right back. If I scan it via obdii the code isn’t there, if I check abs and airbags, it’s there everytime.

[VStar650CL]

Does your scanner show the Lane Cam and ADAS? I don't know how capable it is. If it isn't showing all the systems on the car, there may be other codes that are hiding. I'll post a CAN list later so you can look it over.

[VStar650CL]

Here's the CAN chart for your '18. I marked all the "receives" for the ABS in red and the transmitting C/U in green. The U1002 can only be from one of the green units. As I know the only fast heartbeats come from the ECM, TCM, SAS, and Lane Cam, but they don't give us specific info about that so I could be wrong.

[D1dad]

My scanner is slightly better than what you’d buy for $50 but nowhere near what I’d need for this. I’m going to take it to my mechanic who has the $10k snap on setup. I can do EPB and sas calibration and monitor some live data.

[D1dad]

Not sure if it’s related in any way, but who knows now days. The back hatch at times doesn’t open all the way while using the button.

[VStar650CL]

The only common problem which might relate those issues is water intrusion into the lefthand kick panel. The SMJ's and other connectors which interface the Main, Engine Room, and Body Harnesses to one another are all ganged there. Water intrusion in that area can cause weird symptoms anyplace in the car.