F02 636 Error Code LS XR4145

[dstriplett]

The tractor has started throwing the F02 636 error code along with the red engine fault warning light. RPMs drop to just above idle. I've found one list online of LS error codes but this code is not on the list. Anyone have any ideas or experience with this problem? T4 engine with 385 hours on the tractor. I also can't do a manual regen cycle.

 

[Eagle1]

s636 F02 (P0335) - Crank over speed / gap lost fault [ECU] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
s636 F02 (P0371) - Crank signal early fault [ECU] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288
s636 F02 (P0372) - Crank signal missing fault [ECU] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
s636 F02 (P0374) - Crank signal lost fault [ECU] . . . . . . .

If you have ODB scanner that works with your tractor you can identify the P code to narrow it down. This is out of my XG3135 manual but should be close to your XR.

 

[dstriplett]

Thanks. Sounds like it's time to call the dealer.

 

[dstriplett]

Dealer says it's a crank sensor part. Part is $130ish bucks. Tractor is out of warranty. Not sure what is going to be required to replace the part. Any clues on whether or not I'm going to have to take the engine apart? What I'd really like to know is how to disable all of this Tier 4 crap.....

 

[Eagle1]

Crank sensor is not emissions related. Just a sensor to let the ECU know where crankshaft is in it's rotation. Part of fuel injection and ignition (gas engine) in modern engines. Pretty common failure point in car engines.

 

[Eagle1]

Looks like it's 1 3-pin plug and 1 bolt to change if it tests bad and the tool wheel is OK. Again going by my Workmaster service manual and the parts book. If there is room to pull it of course.

 

[dstriplett]

Thanks for all of your help. Talked to the mechanic and he said it was an easy fix to replace the sensor. He also suggested replacing the starter switch and checking all of the wiring harness connectors before ordering the crank sensor so we will see what that accomplishes (the ignition switch quit working a few hours ago so I’ve been having to hotwire it). I just don’t understand how it runs fine for about 30 minutes before throwing the code and going into limp mode. How I miss the old days when you didn’t need a computer science degree to diagnose and fix an engine problem.

 

[Eagle1]

Could well be wire harness rubbing on something. The ones running around the radiator are suspect.

 

[dstriplett]

I’ll start up there on the wiring harness. Thanks.

 

[Daugh003]

I have the XR4150 that’s having the same exact issue.Throwing the F02 636 code and then going to the lower RPM limp mode.

What ended up being the fix for this? Did you have to replace the crank sensor?