Customer noticed on VisionLink the hour meter would occasionally change to a lower number than the prior day. No pattern discernable on VisionLink - it may count up correctly for 5 days and then on the 6th day it would go down 3 hrs. Other times it would count back down daily.
Spoke with a (good) TC and he said he's never seen that before. He found no relevant DSNs or CPIs. He assumed Product Link was to blame.
Ran the machine while watching the Synchronize Service Hour Meter screen in ET. All ECMs had matching meters within a couple tenths. Eventually found that after keying-off and then restarting the engine, the Transmission ECM (which is the Master) would lower its meter. After a couple minutes, the other ECMs would sync to the lower meter. I let the engine idle for 0.3 more hours and repeated the key cycle. Once again, the Transmission ECM's meter lowered to what it was at the first key-on (0.3 hrs less). I verified all BAT+ and BAT- wires at the Transmission ECM had proper voltage.
Replaced the ECM and the problem was resolved.]]>
Customer noticed on VisionLink the hour meter would occasionally change to a lower number than the prior day. No pattern discernable on VisionLink - it may count up correctly for 5 days and then on the 6th day it would go down 3 hrs. Other times it would count back down daily.
Spoke with a (good) TC and he said he's never seen that before. He found no relevant DSNs or CPIs. He assumed Product Link was to blame.
Ran the machine while watching the Synchronize Service Hour Meter screen in ET. All ECMs had matching meters within a couple tenths. Eventually found that after keying-off and then restarting the engine, the Transmission ECM (which is the Master) would lower its meter. After a couple minutes, the other ECMs would sync to the lower meter. I let the engine idle for 0.3 more hours and repeated the key cycle. Once again, the Transmission ECM's meter lowered to what it was at the first key-on (0.3 hrs less). I verified all BAT+ and BAT- wires at the Transmission ECM had proper voltage.
Replaced the ECM and the problem was resolved.]]>
This is a place for heavy equipment mechanics, both dealer and private, to share knowledge and discuss our trade. You're encouraged to participate in the conversations and contribute as often as you'd like.
We all understand that formal training in our industry is a small part of how we grow our knowledge base. Rather, many of us learn most from researching available literature, logically problem solving, and seeking advice from more experienced technicians. This forum provides an opportunity for us to collectively share our years of experience and help each other grow.
Please share this resource with your co-workers and encourage them to engage in the discussions.
Note: This forum does not serve to provide advice or instruction that would replace the services of a dealership or other qualified technician.]]>
This is a place for heavy equipment mechanics, both dealer and private, to share knowledge and discuss our trade. You're encouraged to participate in the conversations and contribute as often as you'd like.
We all understand that formal training in our industry is a small part of how we grow our knowledge base. Rather, many of us learn most from researching available literature, logically problem solving, and seeking advice from more experienced technicians. This forum provides an opportunity for us to collectively share our years of experience and help each other grow.
Please share this resource with your co-workers and encourage them to engage in the discussions.
Note: This forum does not serve to provide advice or instruction that would replace the services of a dealership or other qualified technician.]]>