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Obviously the car won't go to READY with the service plug disconnected. Coulomb wanted you to remove the MCU fuse and see if the car would start with the OBC/DC converter power connection to the pack removed, i.e. the temporary fuse removed. As a safety concern, there will be HV on the big capacitor inside the MCU connected to the lines that the fuse is attached. That HV is supposed to bleed off over about 3 minutes, so check the voltage on the HV at the MCU terminals before touching the fuse to remove it, then replace the service plug if it has been disconnected. That was the test, not to remove the E-03 connector, just the fuse.Since you tried to start with the service plug disconnected, then there has likely been a DTC code thrown that may resolve on it's own, or may need clearing by external means. Sometimes it seems that codes may clear after the Aux battery has been disconnected for a couple of hours, e.g. loosen and remove the negative terminal on the Aux. Also there is a position switch inside the service plug housing that sends a signal to the EV-ECU, and that must be working properly or P0A0A gets set. Check the FSM for whether or not a MUT clear is needed if the service plug gets disconnected and starting is attempted. Also with the E-03 connector open then there has likely been additional DTCs thrown. You can't be sloppy when working with HV and software-controlled systems and expect happy results, usually The Bad Thing™ happens.
Obviously the car won't go to READY with the service plug disconnected.
Coulomb wanted you to remove the MCU fuse and see if the car would start with the OBC/DC converter power connection to the pack removed, i.e. the temporary fuse removed. As a safety concern, there will be HV on the big capacitor inside the MCU connected to the lines that the fuse is attached. That HV is supposed to bleed off over about 3 minutes, so check the voltage on the HV at the MCU terminals before touching the fuse to remove it, then replace the service plug if it has been disconnected. That was the test, not to remove the E-03 connector, just the fuse.
Since you tried to start with the service plug disconnected, then there has likely been a DTC code thrown that may resolve on it's own, or may need clearing by external means. Sometimes it seems that codes may clear after the Aux battery has been disconnected for a couple of hours, e.g. loosen and remove the negative terminal on the Aux. Also there is a position switch inside the service plug housing that sends a signal to the EV-ECU, and that must be working properly or P0A0A gets set. Check the FSM for whether or not a MUT clear is needed if the service plug gets disconnected and starting is attempted. Also with the E-03 connector open then there has likely been additional DTCs thrown. You can't be sloppy when working with HV and software-controlled systems and expect happy results, usually The Bad Thing™ happens.
