The 2zr-fe engine swap guide

[CrankyOldMan]

The 08-09 xD did not have an immobilizer. The 09+ Yaris does. From what I can tell, the immobilizer has dedicated signal lines to the ECU. If the signals aren't there, the car won't turn over. My thought is that if the ECU doesn't have the inputs from the immobilizer in the first place, it doesn't matter that the key transponder and immobilizer are still in the vehicle. As far as I can see, there's no other connection from the immobilizer to the starter switch or relays.

Take it with a grain of salt, I haven't actually done the swap.

Edit: Here's the wiring diagram for the Yaris immobilizer. The only communications line that doesn't go directly to the ECU is pin 9, which is wired to the OBD II/DataLinkConnector (pin 7 - SIL). As far as I know, that's only used for external diagnostics. I would add a picture of the xD, but there's nothing to show for unused connections on the diagrams.

[CTScott]

Originally Posted by CrankyOldMan

The 08-09 xD did not have an immobilizer. The 09+ Yaris does. From what I can tell, the immobilizer has dedicated signal lines to the ECU. If the signals aren't there, the car won't turn over. My thought is that if the ECU doesn't have the inputs from the immobilizer in the first place, it doesn't matter that the key transponder and immobilizer are still in the vehicle. As far as I can see, there's no other connection from the immobilizer to the starter switch or relays.

Take it with a grain of salt, I haven't actually done the swap.

Edit: Here's the wiring diagram for the Yaris immobilizer. The only communications line that doesn't go directly to the ECU is pin 9, which is wired to the OBD II/DataLinkConnector (pin 7 - SIL). As far as I know, that's only used for external diagnostics. I would add a picture of the xD, but there's nothing to show for unused connections on the diagrams.

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.

[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)?

[CTScott]

Originally Posted by CrankyOldMan

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)?

With one of the prior 2ZR swaps I helped with there was an issue where the non-immobilizer ECM started acting like it was immobilizer enabled when the chassis still had the transponder key ECM present. So, when installing a non-immobilizer ECM you do need to make sure that the transponder key ECU is disconnected.

Unfortunately the opposite is not true, where installing an immobilized ECM in a non-immobilizer car eliminates the immobilizer function.

[CrankyOldMan]

Originally Posted by CTScott

With one of the prior 2ZR swaps I helped with there was an issue where the non-immobilizer ECM started acting like it was immobilizer enabled when the chassis still had the transponder key ECM present.

That makes sense from a design standpoint: our shift-by-wire products have to have a secondary communication system in case the direct line to the TCM fails. It's not always a second CAN line, so the K-line would be a viable backup.

[beaker]

Does anyone know if the Yaris 1nz alternator and ac compressor will work on the 2zrfe? I know Armstrong Racing mentioned earlier that the starter from the Yaris would work, I'm just wondering if the Alternator and AC Compressor would also.