NAS ECM

[rgki...@gmail.com]

I have a NAS ECM which does not use a tune resistor, and there is no provision for one in the harness. I am toying with the notion of burning a few EEPROMs with alternate fuel maps (SreveSprint); will a resistor need to be added to select the map loaded on the chip, or will it default to a single loaded map? Is the ECM going to recognize resistor values to select a map, or am I better off starting with an earlier ECM?

[rgki...@gmail.com]

I did find that if you install the tune resistor in the vacant plug, and install an EEPROM that requires one, it recognizes the resistor and you can select tune. The NAS EEPROM does not see the resistor and stays on the NAS map; in other words, you have to add the resistor provision AND the non-NSS EEPROM to switch maps. Apparently the ECM is the same regardless of market.