The 2zr-fe engine swap guide

[CrankyOldMan]

Originally Posted by CTScott

The immobilizer is fully linked to the ECM. The Transponder key ECU reads the key and sends the key data to the ECM. Without that data the ECM will not allow the engine to run.

SIL is the K line of ISO-9141. It was used for OBDII diags prior to CAN, but was used for the immobilizer and the comm between the SRS ECU and the ECM on 2nd gen Yaris and various other Toyotas up to 2012.

So even with a non-immobilizer ECM, there's still a chance that the immobilizer will prevent the engine from running (via K-line)? Is the fix for that to just get a non-immobilizer ECM and disconnect the K-line from the transponder key ECU (or remove the transponder system entirely)?