thanks foster, got the wideband for the open loop but need a scantool for the closed loop, what other units are people using to tune their FTC in closed loopDick Foster said:Scan tools are typically only a monitoring aid and used to read and reset diagnostic codes etc. To actully tune the EFI system takes a lot more than a scan tool. You would start with a wideband O2 fuel/air ratio meter, some way to access and rewrite the fuel and timing maps, some way to actually measure power gain or loss and go from there. BTW I don't know if anyone has cracked the security codes for the ECU used by Toyota for the Tacomas yet but it does have a self correcting feature built in that you would need to address. Scan tools can give you some helpful indications but you need much more to actully tune the ECU. A minimum would be the wideband O2 and a GTech along with lots and lots of patence and a full understanding.