We have a machine with remote control that we need to be able to cycle ECU power to clear active DTCs, while keeping our IQAN control system powered on, using a digital output with relay to control how long the power is disconnected from the ECU (essentially acting as a keyswitch).
After a 10 second power cycle to our engine ECU (John Deere) to clear active DTCs being broadcast on the DM1 channel, and allow for engine rolldown if it's running, the DM1 channel goes back to 0, indicating no active DTCs, yet the MDGN Red Stop Lamp channel is true (see image). As I understand it, the lamp status is part of the DM1 message. So if there is no DM1 message being broadcast, how is the value of this Module Diagnostic Channel still reading true???
Is the MDGN lamp status not read from the DM1 message? How is the MDGN Red Stop Lamp status read? Why does the amber warning lamp not come back on if the red stop lamp does?
The engine still starts and runs, which it would not do if there were an actual Red Stop Lamp event occurring.
When cycling power to the ECU and the MD4 at the same time, the red stop lamp does not come back on and all active DTCs are cleared
I really like the addition of the lamp flashing option, it would be very useful for Tier IV engine applications, but this MDGN is just not acting how I expected it to.
Any help would be much appreciated.
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