Comments On Trouble Symptom

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

In case that the AWD-ECO/LOCK indicator flashes but no diagnostic trouble code is stored, the AWD-ECU power supply circuit system may have a problem.
If the AWD-ECU power supply voltage is approximately 6 V or less when the system is in operation (always), the CPU of AWD-ECU automatically shuts down. At this time, if the AWD control is in operation, the system will switch the drive mode into FWD gradually to protect the drive train. AWD-ECU cannot store the diagnostic trouble code because the CPU shuts down. In addition, the combination meter determines the AWD-ECU time-out, and flashes both AWD-ECO/LOCK indicators.