4020_JohnDeere
New Member
I have a CAT 287C (MAS01577) it has several codes (all codes listed in attachment) present for both side speed sensors and an event code E568-2. This all happened after the left side track kicked off of the front roller towards the machine. I’ve inspected the speed sensor harnesses for both sides already. No chaffing or any damage to the sensors or their wiring is present. 8.13 volts are present at both sensors on pin 1. No voltage or ground signal present on pin 2 for either side. The machine will also only start if you turn the key on fast. If you turn it one click and wait a second (I’m assuming it runs an on board diagnostic check during this period) it will not start. If you start it immediately, the machine starts and the park/hydraulic release button turn off all lights but the parking brake and all bucket functions work correctly. Was advised that the speed sensors and harnesses were a problem area (due to being damaged, etc.) so I already replaced the left side sensor. Nothing changed. Any and all help is appreciated!
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