This is an old revision of the document!
If your car is not retaining settings with V3, it's because the ECU is not shutting down normally by remaining on for 6 to 10 seconds before the MFI relay clicks off. The cause could be that the car's wiring was changed so that power for the ECU does not come from the stock MFI relay being controlled by the ECU, or battery voltage dropped low enough for the ECU to reset before the MFI relay shut off.
Later versions of the ECMLink ECU firmware are more tolerant of low battery voltage situations. v3.18.205 of the ECMLink ECU firmware introduced a check of battery voltage to avoid initiating a save of changed settings to the ECU unless the battery voltage is sufficiently high. In this case, the unsaved changes are lost without reverting everything to defaults.
